My mobile data error please network problem please activate mobile mobile data

Did you check if your carrier settings are up to date?

Manually update your carrier settings on your iPhone or iPad - Apple Support

avinash286 Said:

"My Mobile data error please mobile network activate"

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Update Using a Computer:

Use my User Tip:  Update your iPhone Using a Computer - User Tip

Back Up First:

IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update.