@ST6
Unless you are abroad (which you didn't mention) you can use either apn, so I doubt that was the problem in your case.
Maybe just the fact that you reset the network settings in doing so fixed it.
You won't get visual voicemail or wifi calling unless you use the idata apn.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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