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Dec 24, 2015 9:01 PM in response to pinpilinpaushaby ChrisJ4203,You can, dependent on the size of the SIM. As the iPhone has progressed, the SIM has changed sizes, so it would depend on going from what model to what model. You can take a look at this support document that is used to identify iPhone models, and it details which SIM is installed in each device. As long as the descriptions are the same, you should be alright. Only other difference is if your cellular carrier makes any changes to their SIMs as technology progresses too. I remember having to change my AT&T SIM as they went to 3G, then again as they introduced LTE. Normally, depending on what carrier you have and where you purchase the phone, they come with a carrier SIM, unless you purchase an unlocked/SIM free device. Identify your iPhone model - Apple Support