R-SIM8 iPhone 5/4S CDMA PC SOFTWARE ASSISTED PATCH NO JAILBREAK NEEDED.
Updated for iOS6.1.4 and Now Supports R-SIM7+ and SAMSIM and XSIMCARD.

This PATCH and ACTIVATION CODE is for iPhone 5/4S CDMA/WCDMA (
Sprint/Japan AU/Verizon ). Will fix 3G and 4G 128k, 256K SIMCRADS unlock
problems, Solve SMS problems on CDMA/WCDMA iPhones when unlocked.
This PATCH does NOT required Jailbreak, Very easy to install with a
cable and PC.

Download iPhone 5 R-SIM8 PATCH HERE

Download iPhone 4S R-SIM8 PATCH HERE

R-SIM Special PATCH is FREE for
for R-SIM8, You DO NOT Need to Pay for this PATCH for R-SIM8, It is
already included FREE for every R-SIM8 Shipped, only R-SIM7+, SAMSIM CARD amd XSIMCARD needs to pay for the patch.

After connecting your iPhone to your PC and Opening the Downloaded Patch
you will get a confirmation as below and iPhone status, NO JAILBREAK
NEEDED

1- PATCH CONNECTED NO JAILBREAK NEEDED

2- SELECT UNICOM FOR 3G

3- Here you MUST put the ACTIVATION CODE

4- ACTIVATION CONFIRMATION , code OK

5- NOW INSTALL AND REBOOT

THIS PATCH IS STILL THE ONLY
SOLUTION AVAILABLE TO FIX 3G DATA & SMS ON SPRINT, VERIZON, JAPAN
SB ALL CDMA iPhone 5/4S NO JailBreak..

Source:
R SIM7 iPhone 5 and 4S GSM/CDMA Unlocking and Activation Solution