How does the Verizon sim card slot work?

I have an iPhone 4s. I got it from verizon and it came with a sim card slot. How does it work if i put a sim card from another phone company? I travel to mexico alot, if i put a Telcel sim card, will i be charged from verizon or by telcel? Please give me a detailed explanation about how it works and the billing

Yes you may still be charged by Verizon. If you plan on using your phone for phone calls with another company you should notify Verizon that you are leaving the country to stop any roaming or international phone options so you can use the sim card.

The sim slot on a verizon iphone 4s are locked. You can't use them unless verizon unlocks it.

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  • Will any Verizon SIM card work in an Verizon iPhone 4S? I had recently acquired an iPhone 4S from an old friend. I was wondering if I could buy a cheap Verizon phone with a pay as you go plan, and remove the SIM from the cheap phone, cut it down to a Micro-SIM, and place it in my new iPhone.
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  • Unlocking a Verizon iPhone 4S with sim card slot? I bought an iPhone 4S off of Craigslist. I'm currently using a T-Mobile plan but the iphone is already using a verizon plan from the previous owner. The iPhone does have a sim card slot in the side so can i put in my t-mobile card slot? How would I "unlock" it from verizon? Any help is appreciated.