Cheapest Way to have iPhone?

My mother is being told she can only have an iPhone activated with her phone company if she purchases an unlimited $50 plan. She doesn't use her phone very much, so she doesn't feel it would be suitable for her. Is there any other cheaper plans anyone knows of?

Buy a lock one for AT&T or Verizon. Starting at just 199$
Available on apple's website or apple stores!

Virgin mobile has the iPhone 4/4s at 35$ a month. Even though it cost 650$ for the 4s and 550$ for the 4. But after two years, you're actually saving money. And it's prepaid.

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