As I am still seriously contemplating switching from AT&T to T-Mobile, I'm trying to figure out my best path to do so and not to pay a bunch in the device switch. http://www.t-mobile.com/offer/switch-carriers-no-early-termination-fee.html I am still under contract for 4 of the 5 lines on my AT&T account (current total ETF for the 4 lines stands at about $700). I have 3 iPhones that are all unlocked as well. 2 lines still have the grandfathered AT&T unlimited plans. Ideally, I'd then buy 2 more older unlocked iPhones on ebay/craigslist for the 2 kids lines. From what I read, to get the ETF reimbursement, I must do all of the following: 1.) Trade in current phones 2.) Buy a new phone from T-Mobile 3.) Send T-Mobile a copy of my AT&T bill with the ETF fees and then get a pre-paid MasterCard 8 weeks later I am definitely not going to trade in my current 32 GB iPhone 5S to them for $260 and then buy the same one for $750. It's a bit of a pisser that they have this trade-in/buy stipulation for the ETF waiver. Supposedly you can trade in any working phone and not necessarily the one that you will be porting over from. SO, I figure that I would: 1.) Trade in 3 basic phones that I have and even get another $20 GoPhone to trade in if they really really require it. 2.) Buy 5 of whatever the cheapest phones they are offering. I've even seen those Nokia 521 phones now at Best Buy for $70 (may not be bad as backups). 3.) Get the lines all set up with our ported over numbers. 4.) Go back and then switch over all the lines to my existing unlocked iPhones. Does that all make sense? Seems like a semi-hassle, but would be the most cost-effective method that I have come up with (so far) to take advantage of getting all of my lines on T-Mobile with all of them as smartphones AND saving about $50/month compared to AT&T. Who's got a better plan to share? Thanks!