I switched from ST $45 Unlimited to the $30 T-Mo plan today. I'm currently using an unlocked AT&T iPhone 5 on 6.1.4 with the latest carrier update from T-Mobile.
After activation, I was surprised when I saw the 4G icon. I guess I'm in a refarmed area? I'll see the E (Edge) icon every once awhile though.
My question is that my 4G speeds and signal have been very spotty. Maybe I'm not really on 4G? Will the replacement phone with the AWS 1700+ offer significant improvement?
Yes it will definitely.
I've been looking into getting mine replaced. My AT&T iPhone 5 is unlocked and works freaking amazing on T-Mobile. But every once in a while I see the E icon.