I recently purchased an unlocked Huawei E856 mobile wifi.
I intended to use the t mobile sim card from my tablet.
When I switched it on it connected to T mobile and to my (and other peoples) devices.
The display shows a phone with transmission waves and then a series of X's and despite showing connected would not download any data.
My original sim was a combi - I thought that may be the problem and so after an unbelievably frustrating few days managed to get hold of a standard sim. This produced exactly the same result. I did try a mate's 3 sim and that worked fine. What am I missing?