Can I use an IPhone 4S bought at Sprint with Verizon?

I bought an iPhone with Sprint but I can't ever use it because I never have any kind of signal. Sprint always says that they're upgrading their networks when I've complained.

I was wondering if its possible to switch carriers? I don't think it is, but I'm being hopeful.

Not possible. Verizon will not activate a phone on their network if the ESN isn't already in their database. Even if you flash it to Verizon it won't work.

No, until the contract ends.

No.

While Verizon and Sprint both use CDMA, Verizon will not activate a Sprint device.

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