Now that you’ve read the Verizon, Cingular, and Sprint versions, we just had to give you some insider tips from T-Mobile as well. If you have any to add, please leave us a comment. Continue reading to see them all.

T-Mobile price matches

“T-Mobile has a policy that they do not advertise that is called a price match guarantee. This states that they can honor any price that has been printed (advertisement), as long as the terms and conditions are the same as T-Mobile’s. It also states that you can get an account credit if the price of the phone goes down within 30 days.”

Shop at the end of the month

T-mobile has a quota system for reps. They’ll be more generous at the end of the month. “Go in to purchase service during the last 5 days of the month. This is the time that is most crucial for store reps and their managers. They need to make sure to get quota, and everyone is more lenient during the end of the month.” If it’s not the end of the month, you can still try to take advantage: “If you have already been approved for service and you are not offered the deal that you want, give the rep your phone number and tell them to call you when they can give you a good deal. I had a customer do this and get what they want on the last day of the month because we were 2 activations short of goal.”

Use features to get free stuff, avoid insurance

“As other reps have stated, features are a big portion for reps. Any data feature nets the rep some extra cash. Use that to your advantage and ask them to throw in some accessories if you buy unlimited messaging or t-zones. The only thing that does not earn us money is insurance, so stay away from that one.”

Never get a 2 year contract

“As the VZW rep said, only sign a one year contract. Yeah you have to pay 50 bucks more, but you can upgrade again in 11 months.”

Unlock your phone

Immediately call into customer care and ask to have your phone unlocked. Unlocking your phone allows your phone to be used with any GSM carrier (Cingular is the only other national US carrier). T-mobile will unlock your phone for free at anytime during or after you contract. Once you unlock your phone, you can now use a cingular sim card or any sim card in the world. Whether or not you plan on traveling, you have still increased the resell value of your phone by quite a bit

[via Consumerist]