T-Mobile Responds to Customer Concerns Regarding AT&T
How long before I have to choose a more expensive plan for the same level of service?
From the T-Mobile FAQ:
Will my rate plan change because of the acquisition?
We will honor all customer contracts entered into before the change of ownership.
It seems to me they're implying that after your contract ends, you will have to choose a current (and almost certainly pricier) plan and replace your SIM card.
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