Hi Guilondero
As indicated above it seems to be a configuration issue, so we need to analyse your configuration... for that you need to send us your configuration file(.cfg) which may contain private information as (APN, APN user, APN pass, Server, Port, GSM numbers, RFID ID numbers, etc)... my bad, I did not clear it enough.
Please contact us using my first comment directions, and we will help you.
Best regards