right....got an Iphone 4 which I am going to reactivate as it has not been used for a while

It will just be a phone for the car (old car) as there is a system in the car for it. I really just want it for maps/sat nav etc. although taking/making calls hands free will be available.....

Question.....if I get a pay as you go sim ....will this be enough to activate and use the maps function ?

any advise gratefully received