Hello
We are having trouble getting our GPRS modem to recognize a ACTIVATE PDP CONTEXT ACK message and are trying to determine if the error is in the modem, in OmsoSGSN or somewhere in between.
Probably in OsmoSGSN as I have exactly the same problem with several phones. Those that work more often than others are Nokia 6230i (not a smartphone) and HTC TyTN (smartphone, but an older one).
Regards, Radko Krkoš