Ive tried searching but no one had the same problem as me.

Here's the problem, after jailbroken and unlocked my Iphone I can add contacts but when that contact text or calls me it only shows up their number instead of their name. I tried adding their number on the text message but it doesnt work. any help would be great Thank you!

Iphone 3gs 16gb, IOS 5.0.1, BB 06.15.00