I have an old mobile. It's dying and ds has now smashed the screen 
I want to keep my sim (on 3, one-plan. Unlimited everything including Internet for £16 a month)
My iPad is also on 3 (lucky, not deliberate!)
Can I just put my sim in the iPad and keep paying my bill?
I have done it short-term in the past and never had a problem.
Will 3 be bothered what device my sim is in?
Will I have to use it to send a text every month?
Anybody know... Without guessing!
I will ask in car phone warehouse later, when I go in to town.