How to Fix iPhone 4S problem
May be you are facing network problems while using iPhone 4S.Moreover, some of you are who were already using activated micro-SIM card with enabled PIN protection feature for iPhone 4 and then insert the same SIM card into iPhone 4S after upgradation. This issue has nothing to do with SIM Card nor with the carrier. However, T-Mobile has already got a temporary solution to their users till the Apple release a small fix in the form of iOS 5 update.
How to disable the PIN code request of micro-SIM used in iPhone 4S:
Step 1:Go to settings>Phone
Step 2:Click on “SIM PIN” option.
Step 3:Move the slider to off (0)
Step 4:Enter your four-digit PIN and confirm by pressing “Done” at the top.
Step 5:Once you are done with step 4, you will see that PIN code request is turned off for your Micro-SIM.
Step 6：If you are already effected with this problem then Just do it now into your new iPhone 4S.
Last edited by 38115-2; 06-09-2012 at 03:13 AM.
I still have this problem , sim pin is not enabled but my network goes & comes no of times in a day.
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