eto po ung naka fix ng issue sa phone ko na matagal ko ng inantay at alam kong darating =)
To Fix SMS Bug and 3G Connection on a KDDI iPhone 5, follow the steps below
Step 1: Jailbreak iPhone using Pangu
Step 2: After jailbreak process, open Cydia and go to Sources section.
Step 3: Tap edit and click add to add the repo
www.isamteam.com/
Step 4: Click the repo you've added and go to All Packages and install the Letter M patch.
Step 5: Open the Rsim app and select wcdma 3g.
Step 6: If Step 5 didn't work, go to unlockpro.ru/nano4g and install iRose.
Step 7: Open iRose and select "force 3g"
Step 8: Turn off the wifi so you can try if the 3g is working.
Step 9:
For the USSD fix (*143#)
Step 1: Add the repo biteyourapple.net.
Step 2: Search for CommCenter Patch for iOS7 (the one that is from biteyourapple.net)
Step 3: Install iFile.
Step 4: Open iFile and go to var/mobile/library/Carrier Bundles/iPhone/carrierdefault.bundle then tap carrier.plist and Property List Viewer.
Step 5: Scroll down and enable SupportSupplementaryService.
Step 6: Restart the phone.
Step 7: Test *143#.
Step 8: Congratulations! You can access USSD Services!
credit : sir A. Lagman thanks for helping me sir