can i reactivate my t-mobile sim after 6 months of not in use?

Might depend on exactly what kind of "not in use" you mean, but it shouldn't be too difficult of a process. Worst case scenario, you'll get a new SIM card with the same number, if they haven't already assigned it to somebody else. You'll want to call T-Mobile or visit one of their stores to find out more.
 
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