About a year ago, I lost my phone and bought the exact same one on ebay from a seller with over 10,000 reviews and a 98-99% positive rating. When I went to activate it, they said they couldn't and it was probably a stolen phone. Luckily, I got a refund and found my old phone, so it ended well.
Now, I'd like to upgrade from the Samsung A900 to the HTC Mogul (I have Sprint). But because my plan is only $30/month, I won't be eligible to receive the $150 discount for staying with them for 2 years. I can barely afford it with discounts and rebates.
Since I really want a fancy phone, I'm considering risking ebay again. What can I do to ensure that I get a phone that will work this time? What's an
ESN number? Can I get it before I buy it and clear it with Sprint first? Will that solve the problem?