I recently got an S7 online it came from America and it was on Verizon but the trouble is I am in Britain and I have a bt sim card I can't use mobile data can anyone help?
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If it is a locked phone you will need to get the unlocking code from your previous provider. If it is unlocked you will need to go into the settings and ensure that the "Mobile Networks" > "Network Operator" is set to BT.
Have you checked that the data usage setting is turned on.
I think your problems are related to the phone having been on the Verizon network.
Have a look at this link and work your way through it to see if there is a setting you have missed.
How To Fix Mobile Data Problems On Your Galaxy S7 (techjunkie.com)
How to change APN settings on an Android mobile phone | BT Help