Today I received a message saying that there’s a cellular network update available. It seems that Zain started rolling out to iPhone devices the automatic cellular data network configuration (similar to iPhone owners on VIVA). To make sure that you have updated the settings of Zain successfully, go to Settings > General > Network then you will find that manual configuration for data network is not available anymore.

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Update: I discovered extra features after the network update which will be seen in Settings > Phone

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