After update to IOS 4.3.5 my Iphone incoming and out going calls is not working properly and I have to remove the SIM regulerly to conduct or receive a call

after update to IOS 4.3.5 my Iphone incoming and out going calls is not working properly and I have to remove the SIM regulerly to conduct or receive a call
It is not practicale to do this always any one faces the same problem

There may be a problem with the SIM card. Get a new SIM card from your carrier - there should be no charge for a replacement.
If no change with a new SIM card, the standard troubleshooting steps in order are:
Power your iPhone off and on.
An iPhone reset, which is done by pressing and holding the home button and the sleep/wake or on/off button simultaneously until you see the Apple logo and then release.
Restore your iPhone with iTunes from your iPhone's backup.
Restore your iPhone with iTunes as a new iPhone or not from your iPhone's backup.
If no change after any of these steps in order, your iPhone has a hardware problem.

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