Answer to "I have always a bad range,very low connection"Yes you can, and it is less difficult than it seems. 1. Carefully open the rear case with a plastic spudger or your finger nails (if you don't mind to spoil these...). The case is glued to the back side, but with a little force and some patience it will come off. 2. At the inside of the case you will find the copper contacts that pass the signals to the antennas. Lift these contacts carefully with the spudger. Take a piece of double sided adhesive tape and place it below the contact. Stick it back again and it now will probably be able to make a connection. On Youtube you will find some video's that demonstrate how to open the One X.