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Did you change phones? Sim cards? I am assuming you have the same phone, and they switched out the sim card (or maybe not?) when you changed plans.
Also, all 4G phones are also 3G and 2G phones, and they simply pick the best available. So if you lose 4G coverage, it will simply switch to the wider 3g network and when you're really remote, drop to 2G. This effects data speed primarily, there isn't any qualitative difference between them for voice and text.
It sounds like you might have something screwy with your sim card when the plan changed happened, I would call T-Mobile or visit a store and ask for a new sim card and be vocal about the poor reception after the plan change. Changing plans shouldn't normally effect reception, only changing phones/networks.
I myself experienced reception issues like yours, and the problem was a bad simcard. I'm sorry for the vague answers, but I think your best bet is to go to a T-Mobile store. They should replace the sim card free of charge.
yes they is you can take it to amobile service center and have them reflash the US Verison but you should go to network settings and change the auto to manual search for the band this should give you a better lock on the network and fewer drop calls.