This pattern results in a very thick chunky phone case. Compare the phone size and final cozy size as described below. The chunk could be suitable for absorbing impacts, like dropping your phone! But don’t test that out on purpose, just in case!
The pattern is in UK crochet terminology. Worked as one piece, in the round.
For US readers, the stitches conversion is included in the “Terminology used” section, below, in brackets (or parentheses…!)
The scales are worked up using a repeat of 2 rows, first setting up the Vs which form the frame of the scales, and then using these same Vs (alternately) onto which the scale is built. This is usually termed “Crocodile stitch”, here I’m taking a leap into fantasy land and calling it “Dragon scales”!
The repeat is offset by 1 V each time, to give the overlapping scales pattern.
10 Vs = 5 scales
Final dimensions:
Using double-knit wool with 3.5mm crochet hook.
Width 3 3/8 inch, 8.5 cm
Height 5 1/4 inch, 13.5 cm
To fit phone up to:
Width 2.5 inch, 6.25 cm
Height 4 7/8 inch, 12.5 cm
Terminology used:
st = stitch
sl st = slip stitch
ch = chain stitch
dc = double crochet (sc = single crochet)
tr = treble crochet (dc = double crochet)
ch1 sp = chain 1 space
Round 1 – initial row of Vs.
Ch 14.
Tr in 5th chain from hook (4 ch & tr counts as 1st V)
(Tr, ch 1, tr) in same st. Sk 2 st, (tr, ch 1, tr) in 3rd st. Sk 2 st, (tr, ch 1, tr) in 3rd st. Sk 2 st, (tr, ch 1, tr) 3 times in the last chain.
Turn work around, to work the next stitches in the other side of starting chain.
Sk 2 st, (tr, ch 1, tr) in 3rd st (the same stitch as the V on the other side). Sk 2 st, (tr, ch 1, tr) in 3rd st (the same stitch as the V on the other side). Sk 2 st, (tr, ch 1, tr) in 3rd st. Sl st to 3rd st of starting ch 4.
(10 Vs)

Round 2 – first row of scales.
For this first row of scales, it can be difficult to see exactly what you’re doing, check you are placing the trebles around the correct V.
Using ALTERNATE Vs as the base for the following stitches, first going down one side, then up the other, creates the scales pattern.
Sl st into ch1 sp of 1st V (corner)
4 tr from top to bottom around the RH-side of the 2nd V, ch 1, 4 tr from bottom to top around the LH-side of the 2nd V.
4 tr from top to bottom around the RH-side of the 4th V, ch 1, 4 tr from bottom to top around the LH-side of the 4th V.
4 tr from top to bottom around the RH-side of the 6th V (around the corner), ch 1, 4 tr from bottom to top around the LH-side of the 6th V. Now working on the other side of the piece.
4 tr from top to bottom around the RH-side of the 8th V, ch 1, 4 tr from bottom to top around the LH-side of the 8th V.
4 tr from top to bottom around the RH-side of the 10th V, ch 1, 4 tr from bottom to top around the LH-side of the 10th V. Sl st into the ch1 sp of 1st V.
(5 scales)
Round 3 – second row of Vs.
Ch 4 (counts as 1 tr and 1 ch), tr in same space.
*(tr, ch 1, tr) at the top of the scale. (tr, ch 1, tr) joining the edges of the 2 scales to the V behind.*
Repeat from * to * around. Join with a sl st to 3rd ch of starting ch 4.
(10 Vs)

Round 4 – second row of scales.
Sl st into ch1 sp of 1st V, sl st over the next 2 tr, sl st into ch1 sp of 2nd V.
4 tr from top to bottom around the RH-side of the 3rd V, ch 1, 4 tr from bottom to top around the LH-side of the 3rd V.
4 tr from top to bottom around the RH-side of the 5th V, ch 1, 4 tr from bottom to top around the LH-side of the 5th V.
4 tr from top to bottom around the RH-side of the 7th V, ch 1, 4 tr from bottom to top around the LH-side of the 7th V.
4 tr from top to bottom around the RH-side of the 9th V, ch 1, 4 tr from bottom to top around the LH-side of the 9th V.
4 tr from top to bottom around the RH-side of the 1st V, ch 1, 4 tr from bottom to top around the LH-side of the 1st V. Sl st into the ch1 sp of 2nd V.
Round 5 – Vs round.
Ch 4 (counts as 1 tr and 1 ch), tr in same space.
*(tr, ch 1, tr) at the top of the scale. (tr, ch 1, tr) joining the edges of the 2 scales to the V behind.*
Repeat from * to * around. Join with a sl st to 3rd ch of starting ch 4.
(10 Vs)
Round 6 – scales round.
Always assume the “1st V” is the next stitch after where you finished the last round.
Sl st into ch1 sp of 1st V, sl st over the next 2 tr, sl st into ch1 sp of 2nd V.
4 tr from top to bottom around the RH-side of the 3rd V, ch 1, 4 tr from bottom to top around the LH-side of the 3rd V.
4 tr from top to bottom around the RH-side of the 5th V, ch 1, 4 tr from bottom to top around the LH-side of the 5th V.
4 tr from top to bottom around the RH-side of the 7th V, ch 1, 4 tr from bottom to top around the LH-side of the 7th V.
4 tr from top to bottom around the RH-side of the 9th V, ch 1, 4 tr from bottom to top around the LH-side of the 9th V.
4 tr from top to bottom around the RH-side of the 1st V, ch 1, 4 tr from bottom to top around the LH-side of the 1st V. Sl st into the ch1 sp of 2nd V.

Repeat rounds 5 and 6 until you have reached the height of your phone. Ending on a scales round (R6).
11 rows of scales gives the dimensions as described above.
Finishing:
Dc evenly around the top, joining the scales to the Vs behind as required. Place 2 dcs along the sides of each scale and 1 dc at the ends and middle of each scale (joining to the Vs behind). Join with a sl st. Fasten off.
31 dc, total.
