Unable to connect to mobile data

[Android Central Question]

I have bought a refurbished unlocked s6 and everything works except it won't connect to mobile data (4g, 3g or 2g) I've tried reboots, software updates and calling my provider for help and no real solution found, can anyone help.
I think it's the data settings but I don't know how to fix.
I've even tried to add a new Tesco mobile apn no luck
Any help would be amazing
Ta

 

[Nic80]

It's set to the Tesco mobile network and the Tesco apn
I've spoke to Tesco again today any they did a connection mannualy over the phone with me and no luck so I did a hard reset again nothing.

I think it's not going to connect as I can't find any other ideas I haven't tried.
I feel beaten lol

 

[Nic80]

I've requested one! I didn't think of this to be fair lol