Where else is TMobile active?
SELECT T2.district FROM phone_market AS T1 JOIN market AS T2 ON T1.Market_ID   =   T2.Market_ID JOIN phone AS T3 ON T1.Phone_ID   =   T3.Phone_ID where T3.carrier  =  "TMobile" and T2.district ! =  "Alberta"
TMobile active refers to T3.carrier = 'TMobile'; exclude Alberta from the list refers to T2.district != 'Alberta';