13 Granny Square Crochet Phone Case Patterns You’ll Want to Make Right Now

If you’ve ever looked at your plain, boring phone case and thought, “I could do better than this,” you’re absolutely right. Crochet phone cases are one of the most satisfying small projects you can take on, and granny square designs are especially perfect for the job. They’re quick to work up, endlessly customizable, and the finished result looks like something you’d find in a boutique shop rather than a craft bin. Whether you’re a beginner who just learned how to hold a hook or an experienced crocheter looking for a fun weekend project, granny square phone cases offer something for everyone.

In this post, we’re walking through 13 beautiful granny square crochet phone case patterns, covering everything from classic solid squares to modern colorwork designs. Along the way, you’ll find tips on sizing, yarn choices, closures, and how to make your finished case actually protect your phone. Let’s dive in.

Why Granny Squares Make the Perfect Phone Case

Before we get into the patterns themselves, it’s worth talking about why the granny square is such a natural fit for a phone case project.

First, the shape. A standard smartphone is a rectangle, and a granny square — despite the name — can easily be worked into a rectangular format. You can use a traditional square and fold it into a sleeve, or you can work a rectangular granny motif from the start. Either way, the geometry is on your side.

Second, the texture. Granny squares have an inherent loftiness and structure that provides light padding around your phone. It won’t survive a drop from a second-floor balcony, but it will absolutely cushion the everyday bumps of life in a bag or pocket.

Third, the speed. A single granny square takes most crocheters between 15 and 45 minutes depending on size and complexity. That means a phone case can be finished in an afternoon, which makes it a perfect project for when you want the satisfaction of a finished object without a week-long time commitment.

Finally, the creativity. The granny square is one of the most remixed motifs in all of crochet. Color combinations, stitch variations, border treatments — there are virtually infinite ways to make it your own.

What You’ll Need Before You Start

Most of the patterns below can be worked with a very similar supply list. Here’s a general overview of what to gather before you sit down to crochet.

Yarn: For phone cases, you want a yarn with good stitch definition and enough body to hold its shape. Cotton yarn is the top choice here. It’s firm, doesn’t stretch out over time the way acrylic can, and it comes in an enormous range of colors. Fingering-weight or DK-weight cotton is ideal for most smartphones. Worsted weight will give you a chunkier, more protective case but may add significant bulk.

Hook: Match your hook to your yarn weight. A 2.5mm to 3.5mm hook is typical for cotton fingering or DK, while a 4mm to 5mm hook suits DK or worsted cotton.

Gauge matters here. Unlike a blanket where a slightly-off gauge just means a slightly different size, a phone case needs to fit your actual phone. Always make a small swatch and compare it to your phone’s dimensions before committing to a full pattern.

Notions: A yarn needle for weaving in ends, scissors, stitch markers, and optional closures like buttons, snaps, or a short zipper.

1. The Classic Two-Round Granny Square Sleeve

This is the simplest possible granny square phone case and a great starting point for beginners. You work two large granny squares using the traditional cluster-and-chain method, then sew three sides together to create a sleeve. The fourth side remains open as the phone opening.

To make this work for your phone, measure the height and width of your device and add about half an inch of ease on each side. Work your granny squares to those dimensions. A typical modern smartphone needs a square somewhere between 3.5 and 4.5 inches across, depending on the model.

For yarn, a two-ply or three-ply cotton in two contrasting colors gives this classic pattern a lovely, timeless look. Think navy and cream, or burnt orange and white. Finish the open edge with a row of single crochet for a clean, polished border.

2. The Rectangular Granny Fold-Over Case

Rather than making two separate squares and seaming them, this approach works a single large rectangular granny motif, then folds it in thirds — like a letter going into an envelope. The bottom third becomes the back of the case, the middle third becomes the front, and the top flap folds down over the phone’s screen.

This design is especially satisfying because it produces no seams on the sides. The phone slips into a seamless sleeve with a decorative flap on top. You can add a button or snap to the flap to keep it closed.

The rectangular granny motif is worked just like a traditional granny square but you increase on only two sides rather than all four, so the shape elongates instead of staying square. Once you understand that simple adjustment, the rest of the pattern flows naturally.

3. Color Block Granny Square Case with Button Closure

This pattern takes the classic two-square sleeve and elevates it with intentional color blocking. Instead of using the same two colors throughout, you assign specific color zones to each round of the granny square. The first round might be a deep jewel tone, the second a neutral, the third a bright accent, and the final border a solid dark color that ties everything together.

The button closure is added at the open end of the sleeve. Work a small button loop using a chain stitch along one edge, sew a button onto the opposite edge, and you have a case that won’t accidentally release your phone when it’s bouncing around in your bag.

For color blocking to look intentional rather than random, choose your palette before you start and limit yourself to three or four colors maximum. A simple rule of thumb: one dark, one light, one accent.

4. Tiny Granny Square Patchwork Case

This is a more time-intensive project, but the result is absolutely stunning. Instead of making one or two large granny squares, you work a collection of mini granny squares — typically about one inch each — and join them together in a grid pattern to form the front and back panels of the case.

Mini granny squares are worked over just one or two rounds, so each one takes only a few minutes. The magic is in the joining. Using the join-as-you-go method (JAYG), you attach each new square to its neighbor on the final round rather than seaming afterward, which creates a flat, unified surface with visible but intentional join lines.

A 4×7 grid of one-inch squares works beautifully for most standard smartphones. You’ll need two panels of this size (front and back), which means 56 tiny squares in total. Pick a dozen different colors and arrange them in a rainbow gradient, or go with a more restrained palette of two or three tones for a modern minimalist look.

5. Granny Square Case with Wrist Strap

This design is particularly useful if you’re someone who’s always juggling things and needs your phone accessible but secure. The case itself follows the basic two-square sleeve construction, but you add a looped wrist strap crocheted directly into one of the side seams.

The strap is made by working a long chain and then covering it with single crochet stitches back along the chain, then doubling it for durability. It attaches to the case at the bottom side seam and loops comfortably around your wrist.

To make the strap adjustable, you can work in a small sliding knot or add a metal D-ring from a craft store. A few stitch markers on the strap help keep the ring in place during use.

6. Granny Hexagon Phone Pouch

Strictly speaking, a hexagon isn’t a square — but the hexagon granny motif follows the exact same logic as the traditional granny square and is worked using the same cluster-and-chain construction. The result is a six-sided shape that you can work into a phone pouch with a little creativity.

The trick is to work a long hexagon (sometimes called a stretched hexagon or a rectangle hexagon) rather than a regular one. By increasing on just two opposing sides, you end up with a shape that’s much taller than it is wide — perfect for a phone pouch when folded.

Hexagon pouches have a slightly different silhouette than rectangular cases. They have gentle curves at the bottom corners that give the finished case a softer, more whimsical look. Work a simple single crochet border around the entire opening to neaten the edges.

7. Granny Square Flip Wallet Case

If you want a crochet phone case that actually functions like a wallet, this pattern takes the fold-over concept further. You work a large granny rectangle and fold it so the bottom section is taller than in the basic fold-over design. This creates a deeper front pouch with room to tuck a card or two alongside your phone.

The interior is lined with a simple slip stitch fabric worked in a single color — usually a neutral that contrasts with the exterior granny square pattern. The liner is worked flat and then slip-stitched to the inside of the case before the final border is added, sandwiching the raw edges neatly.

A magnetic snap closure, available at most fabric and craft stores, gives this case a clean, professional look. You’ll need to reinforce the fabric around the snap with a small square of fusible interfacing to prevent tearing.

8. Modern Granny Square Case in Solid Colors

The traditional granny square uses open chains between the clusters, which gives it that characteristic airy, lace-like look. But if you want a denser, more protective case, the solid granny square is your answer.

In a solid granny square, you replace the chain spaces between clusters with additional stitches — typically double crochets — so the fabric has no holes. The result is a dense, sturdy fabric that protects your phone better and also happens to look very modern and graphic rather than old-fashioned.

This pattern looks especially striking in a simple two-color scheme. Work alternate rounds in black and white, or deep teal and ivory, and the solid construction makes the color geometry pop in a way that the open version never quite achieves.

9. Granny Square Case with Tassel Embellishment

This one is about taking a simple sleeve case and making it feel finished and special with a tassel at the bottom. The case itself is standard — two granny squares seamed into a sleeve — but the tassel transforms it from a basic protective cover into something you’d genuinely want to show off.

To make the tassel, cut a bundle of yarn lengths (about 20 to 30 strands) each about six inches long. Fold them in half, draw the loop through the corner stitch of the case, then pass the cut ends through the loop and pull tight. Wrap a length of yarn around the bundle about half an inch from the fold to cinch the tassel into its characteristic shape.

Tassels look best when they’re made from a contrasting color — a pop of bright yellow on a deep purple case, for instance, or a fringe of metallic gold on a rich burgundy square.

10. Granny Square Zipper Pouch Case

Adding a zipper to a crochet project sounds intimidating, but it’s much simpler than it looks and the finished result is genuinely useful. A zippered phone case stays closed securely and gives the case a tailored, urban look that’s a step away from the handmade-craft-fair aesthetic.

For this design, work your two granny squares to size, seam the bottom and sides, then hand-sew a short zipper (usually 6 to 8 inches) along the top opening using a simple whipstitch. Pre-made zipper tape from a fabric store is easy to work with. Choose a zipper color that either matches or deliberately contrasts with your yarn palette.

Work a row of single crochet along both edges of the zipper opening before attaching it — this gives you a stable, even surface for the seam and also protects the zipper teeth from snagging the yarn.

11. Granny Square Case with Felt Lining

One of the practical concerns with any crochet phone case is the screen. If your yarn has a slightly rough texture or if the case is worked loosely, the interior surface could scratch the phone over time. Adding a felt lining solves this problem completely.

Work your granny squares and seam them as usual, then cut a piece of soft felt (acrylic craft felt is fine, but wool felt is nicer and more durable) to match the interior dimensions of the case. Whipstitch the felt piece to the inside of the case using a matching thread and a hand needle. The felt creates a smooth, scratch-free interior while the crocheted exterior provides structure and style.

This approach also makes the case slightly stiffer, which is good for phones without a built-in case already on them. The felt-lined version is particularly popular as a gift because the interior finish looks so intentional and professional.

12. Granny Square Bobble Stitch Case

The bobble stitch is a round, dimensional stitch that pops up from the fabric surface like a tiny bead. When you incorporate bobbles into a granny square pattern, you add tactile interest and a fun 3D texture that makes the case feel as interesting as it looks.

In this variation, the traditional double crochet clusters are replaced with bobble clusters — groups of five or six double crochets worked into the same stitch and then closed together. The result is a bumpy, richly textured surface that cushions the phone beautifully and also happens to provide a better grip than a flat-stitched case.

Work the bobble granny square in a single color for the most dramatic effect — the texture speaks for itself and doesn’t need competing colors to make an impression. A deep, rich color like burgundy, forest green, or midnight navy showcases the dimensional stitches especially well.

13. Granny Square Rainbow Stripe Case

The final pattern in this collection is purely joyful. This design uses the basic two-square sleeve structure but assigns each round of the granny square a different color of the rainbow — red, orange, yellow, green, blue, indigo, violet — then works an additional round in each color to widen the stripes before moving on to the next.

The result is a phone case that’s essentially a wearable piece of color theory, bold and cheerful and guaranteed to make you smile every time you pull your phone out of your bag.

For a more sophisticated version of the same concept, you can swap the bright rainbow for a tonal gradient — working through shades of one color family, from the lightest tint to the deepest shade. A coral-to-burgundy gradient, or a sky blue to deep navy progression, gives you the same satisfying stripe effect with a more polished, grown-up feel.

Tips for Getting the Perfect Fit Every Time

No matter which pattern you choose, fit is everything. Here are the most reliable ways to make sure your case fits your phone correctly before you invest hours in a finished project.

Always measure your phone in its existing protective case if it has one, not just the bare phone. The granny square case will go on over whatever is already there.

Work a small granny square swatch and measure it carefully. If your swatch is too large, go down a hook size. If it’s too small, go up a hook size. Don’t try to force it with blocking — while blocking can slightly adjust dimensions, it’s not reliable enough to save a case that’s significantly off.

Consider the direction of the granny square. If the phone is taller than it is wide (which most are), you may get a better fit by working your square so that the granny’s diagonal runs vertically rather than horizontally. This subtly changes the way the fabric drapes and stretches.

Add a row of slip stitch around the opening after seaming. This tightens and stabilizes the entrance to the sleeve, which prevents the case from gaping open and releasing your phone.

Final Thoughts

Granny square crochet phone cases are one of those projects that perfectly balance function and creativity. They’re small enough to finish quickly, useful enough to use every day, and flexible enough that you can truly make them your own. Whether you gravitate toward the timeless simplicity of the classic sleeve, the practicality of the zippered pouch, or the pure joyfulness of the rainbow stripe case, there’s a design here that will feel exactly right for your skill level and your style.

The best part? Once you’ve made one, you’ll want to make more. They’re the perfect size for using up leftover yarn, experimenting with new color combinations, and making personalized gifts for the phone-carrying people in your life — which, these days, is basically everyone.

Grab your hook, pull out that cotton stash, and start swatching. Your phone deserves better than a boring plastic case, and now you have 13 reasons to prove it.