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Can’t connect to network error

ST6
Level 1: Joiner
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Hi I have turned phone on and off , reset all network settings, reset my iPhone X, updated software but keep getting the error cannot connect to network even though 3G shows. What else can I do as I am unable to use my phone currently unless on WiFi 

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MI5
Level 94: Supreme
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@ST6 

Where did you get the phone from?

Symptoms may indicate a barred handset.

IMEI can be checked here https://www.imei.info/

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.

Currently using:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
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ST6
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I upgraded my phone through o2. Thank you for the help I found a solution from an old post and changing the APN for mobile data in network settings to mobile.o2.co.uk which fixed the error

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MI5
Level 94: Supreme
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@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.

Currently using:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
Message 4 of 4
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