Today, I find out T-Mobile is attempting to charge my credit card for the 6 to 6s plus iphone upgrade (which suppose to be free) based on T-Mobile JUMP ON DEMAND program. To all T-Mobile JUMP ON DEMAND customers: - you are not eligible to upgrade to the new 6S/6S+ at least after 4 months using with the existing phones!! This is ridiculous. When I first discussed with T-Mobile, they mentioned that each user can upgrade to the new devices 3 times a year; however, now they are saying you can only upgrade the device once every 4 months between upgrading. This is non-sense! This is a lawsuit'able case & a breach of agreement.