How to get contact names to display for text messages on iPhone 4s

It's weird because most f my contacts are displayed by their names except for a few who are in my phone book but come up as their phone numbers and it's kind of annoying since its hard to distinguish who is who. Could this have something to do with the fact that i'm using the factory unlocked iPhone 4s with tmobile? Anyone know how/if this is fixable? I already tried to delete the numbers and save them different ways on mh contacts but it still does it:/

This is a problem you need to have apple look at.

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