Hole in the pocket bag or on the outside of the pocket?
One of my pairs of RRLs has had the corner of the pocket bag on the phone side open up...need to sew it back together.
But as for the corners of the phone starting to work their way though the outside of the denim? That's pretty normal...especially with hard-cornered phones like the iphone.
Excuse the cell phone pic, but you can see it happening here (on a different pair of RRLs):
Granted, these jeans are on their 4th phone (hence multiple wear patterns), but none of them have had corners anywhere near as defined as the iphone 4/5. Also, this pair is fairly loose fitting so puts less pressure on the phone.
They will get repaired when they open up...although right now those pants are sidelined awaiting YACR (yet another crotch repair) whenever I stop being lazy.