Then select More.
In the pop-up menu select Mobile Networks.
Since there are two SIM Cards in the handset, click on Select SIM Card option.
Choose the SIM Card you wish to use.
Then select Network Mode.
Click on WCDMA (preferred)/GSM option.
Select Network Operators If you wish to choose your network operator manually.
In the Service Provider pop-up menu, click on search networks.
Since in border towns, your phone might automatically switch to roaming on other operators, choose MTN Irancell and deactivate roaming.