New iPad 3G problem

[mmeade111]

Hi
I just got a new iPad and signed up for 3G network from O2. They set it up in store, installing the sim card etc and it was working fine. However it doesn't seem to work a lot of the time even when I have good coverage. I don understand this, my settings are automatic carrier although it doesn't state the particular carrier and I have cellular data on. I live in the UK and so it is a 3G network not a 4G
Hope someone can help
Thanks

 

[swordfish5736]

did you try resetting network settings? go to settings->general>reset(all the way at the bottom) then choose reset network settings