Which straightalk sim card do I get for an iphone 5?

Http://www.shopstraighttalk.com/bpdirect/straighttalk/PlanList.do?action=view&phoneFilterOptionExtensionId=13836643&productVariantExtensionId=17639196

which one of the sim cards do I get? I know you can cut the sim card to make it fit…

Depends what iphone you have, if its unlocked or not.

So, you much be bringing your iPhone 5 from another network, correct? If so, the contributor is correct that you should make sure your phone is unlocked first.

Regarding your question, Straight Talk's iPhone page says the following about a SIM card, "Although your iPhone on Straight Talk may contain a SIM slot, DO NOT insert a SIM card into it. Your iPhone on Straight Talk works on a CDMA network; inserting a SIM card could alter your settings and stop it from working properly."

They also say, "To activate your service, go to straighttalk.com/Activate or call 1-877-877-1986"