Can i switch my android SIM card to an iPhone without any problems?

I'm buying an iphone. I want to know if i can just take the sim card from my android i already have and put it into the iphone and have it work normally. Or will i have to go to the verizon store or something like that to activate it or whatever?

If the sim card is regular size than you will need to cut it to a micro sim if the iPhone is a 4/4S. If it's a 3GS and below then the regular one will fit. And verizon wireless doesn't use sim cards… Only AT&T and T-Mobile. I hope I helped, you didn't give enough details about your question.