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For those who are using Gevey or R-Sim on their locked iPhone.
Here's how to fix Caller ID on device running iOS 8.0-8.1.2 that does not show name from Contact when calling or receiving call.
1. make sure your device is jailbroken.
2. Open Cydia- Sources
3. (Add only if you dont have this source) click Edit- Add and type: http://bovor.net/ios and click add source
4. Click on bovor.net/ios source- All packages
5. Select 'Fix Caller ID Format on iOS 8.x' package - Install - Confirm
6. Restart SpringBoard. Done!