They charge for just about anything that comes across their imagination. Changing your phone plan? Bam! $30 "service fee" for making the change. Have that mobile plan set up to receive a promo? Call as far in advance as you want of your phone bill's due date, and they'll slam you with "may take 1-2 billing cycles to be applied" and charge FULL PRICE the first couple months before that promotional is applied. This is complete BULL and an obvious scam to get you to unload your wallet for them. Avoid this trash company like the bubonic plauge.
Recommendation: Stay away from this awful, greedy company