Because there are many different devices being used with SpeedTalk Mobile services, we have only tested a segment of those and they are considered “Approved” since they work in our system consistently without problems. With these handsets we are able to provide more support. The “Unsupported” devices are other GSM devices that were not specifically made to work with our current carrier and while they may work we are unable to offer the same support. Please note that features of unsupported devices such as high speed date may not be available with SpeedTalk Mobile.