Default [Q] Cubot One - No network connection


I have just recently received my Cubot One and I've got no network connection although the signal bars are showing that I am connected (but in fact I am not). Thus, I can't call anyone nor can I be called.

Can anyone help me solving this issue?

Android version: 4.2.1
Baseband version: MOLY.WR8.W1248.MD.WG.MP.V6.P6, 2013/06/26 21:17
Kernel version: 3.4.5

Thank you.