This will also fix the Caller ID Format

Yes Follow carefully

1: remove caller id format fix if you installed it from cydia .
2: i suggest using iFile from your iphone or iFunBox from Your pc or Mac
3: Navigate to /Sytem/Library/Frameworks/UIKit.framework/phoneFormat
4: Open UIMOBILECOUNTRYCODE With property List viewer (this works with iFile)
5: Based on the original  IMSI carrier of your phone change it country code to the country code of the sim card you want to use.

If you are using a normal text editor change Imsi  with the country code you want to use .

Reboot is required.
*If you dont know whats your imsi ,Add the source to cydia .
  repo.bingner.com
--install samprefs you will run into activation mode, just remove the sim card , open samprefs , go to info and you will see the imsi code, you will only need the first 3 digits.when done  remove samprefs from your iphone.

AN example

Sprint IMSI is 314 THe country is us , lets say you are in France and you want to use a french sim change the us to fr save and reboot
.
for more info or help just reply back