Switching from iphone 4 to galaxy s3?

I have verizon so its not as easy as just switching out the sim card. My iphone doesn't have a card and the galaxy does (it's a used one from a family member) verizon is closed now till morning so I can't just go to the store and I'm not sure I'll have gas to get there before the next 3-4 days. Is there any way i can switch phones tonight over the computer or anything? I really need a phone by tomorrow I'm in college and I have a lot of work I need my phone for tomorrow

Added (1). I messed up my iPhone and it's saying it's not activated so I have no phone right now and I really need one.

Added (2). I don't have the s4. I already have an s3 from someone and my contract is up in 4 months so I'm not buying another phone now.

Better switched to galaxy s4… Or lumia 925

I have the S3. I LOVE IT!
I have Virgin Mobile and pay $35 a month. The phone was expensive upfront, but you will save in the long run. Plus right now you get 2 months free when you pay the first one.

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