The problem solved.
Thank you very much.
Hi Bryan,
Sure, thank you.
Hi Bryan,
Thank you for the reply.
Yes, ‘FAST.T-MOBILE.COM’ is my APN.
also, I turned on the debug mode and find :
rcvd [LCP ProtRej id=0xcb 80 fd 01 07 00 0f 1a 04 78 00 18 04 78 00 15 03 2f]
Feb 25 15:45:52 mtcdp daemon.debug pppd[1626]: Protocol-Reject for ‘Compression Control Protocol’ (0x80fd) received
Feb 25 15:45:53 mtcdp daemon.notice pppd[1626]: Modem hangup
Feb 25 15:45:53 mtcdp daemon.notice pppd[1626]: Connection terminated.
is this the problem?