I'm in the market for upgrading my DX to a Maxx HD. I'm on a family plan and although my line is not eligible for upgrade, another line in my family share plan is, which I was going to swap for mine. I did this with my wifes phone a year ago on LetsTalk.com no problem. I tried to order a Maxx HD on Amazon and this was their response: "You won't be able to switch your phone between different lines for the first 181 days of service if you choose to order through AmazonWireless. While your service provider may offer this option when ordering directly through their stores, this service isn't available on our website. If you move your device to an alternate line within the first 181 days, you'll be subject to additional charges by AmazonWireless of up to $250 per phone, plus applicable taxes." Is this the norm for all non-Verizon retailers or just for Amazon? What is a good retailer to use in terms of price and service? I live in Taxachusetts so I'm trying to beat the sales tax.