Do not...I repeat do not switch to T-mobile! We made the switch from Verizon 2 months ago and regret it every day. We were with VZ for two years and they were expensive but I can count on one hand the number of dropped calls (with the exception of known dead spots). We started dropping calls the first week with Terrible-Mobile. On top of that, they baited us by saying that in addition to paying our early termination fees they would also give is up to $250 for each cell phone we traded in no matter what brand as long as they were working. So we traded in 3 phones...not the latest but a note 2, an LG and a nexus original. 8 weeks later they gave us a whopping $35 for all three. Like I said, we drop calls daily and it's the worst experience we've had. Note 4s and terrible reception...go figure!
Ooh, let me try this!
'Do not...I repeat do not buy a membership to Costco! I bought a membership 2 months ago and regret it every day because the nearest one is over 100 miles away.'
I.e., one man's junk is another man's treasure, and vice-versa.
As to 'baiting' you, every company that ever wants to sell a product or service needs to entice it's prospective clients. If it were 'bait and switch,' that would be an entirely different matter, but it doesn't appear to be what you're describing. As to the value for the 3 phones, if they were all in good working order, I'm skeptical that they would only offered a $35 credit in sum if they did indeed meet their required criteria, but regardless, you as a party of the agreement should have sought a commitment as to that value (or at least a range) at the start to determine if you might be better off simply selling them on your own (much like when considering trading in an old car vs selling it outright).