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Here's a work-around: When you load the picture on your iPhone, take a screenshot of it (full screen with no menus) and use that as the contact picture.
 
Even if you imported the photo from outside, you should still be able to make it full screen by opening the contact on the phone, and hit edit on the photo, then saving the edit. That has always switched it to full screen for me.
 
Is there a way to set it up NOT in full screen?

Yes, crop it down to lower resolution and it will show up small only

Anyways, seems Apple want to show small only starting 7.1 Beta 3 there is no provision for Full Screen Caller ID anyways
 
Yes, crop it down to lower resolution and it will show up small only

Anyways, seems Apple want to show small only starting 7.1 Beta 3 there is no provision for Full Screen Caller ID anyways
Lets hope it's one of those beta oversights/bugs and Apple won't actually remove that option in 7.1 when it comes out.
 
Yes, crop it down to lower resolution and it will show up small only

Anyways, seems Apple want to show small only starting 7.1 Beta 3 there is no provision for Full Screen Caller ID anyways

And it will show up like a thumbnail on the upper left?
 
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