I have a pay monthly sim, can i put a pay as you sim in for when i'm abroad?

I have a IPhone and a pay monthly sim, when i go abroad would it be possible to put a pay as you sim in the phone just while i'm abroad? And put the pay monthly back in when i get back to england

Yeah! If your phone is locked to the network you would need the same network sim tho example if your with O2 pay monthly you will need an O2 payg Sim