Here’s some measurements
The Fallout 4 Pip-Boy Edition may be sold out, but you can see if it will actually fit your current smartphone, compliments of a new blog update from Bethesda. According to the publisher, the foam inserts will fit the iPhone 6, iPhone 5/5s, iPhone 4/4S, Samsung Galaxy 5, and Samsung Galaxy 4. A “custom” insert should fit “most” devices, and without the insert, the inside measures at 141.2mm x 71.6mm x 10.2mm.
Sadly, the iPhone 6 Plus is too big, as is the Samsung Galaxy S6. I sprung for the regular 6 myself — the Plus is a little large for my tastes. If you want to get a better look at the inserts, hit up the gallery below.
Fallout 4 [Bethesda Blog]