I am experiencing problems sending OTA messages for the configuration of WAP service settings to a 6310i or 3510i. The SMS messages are delivered by the SMSC, but no 'service settings received' message is displayed on the phone (and obviously neither are the settings present afterwards). There is no difference in behaviour when the settings are GSM CSD or GPRS settings.

Using the same code with other models, like the 6310 (not the i version) and 7650, no problems occur. My code complies to version 6.5 of the OTA specification.

Did the OTA format change with the 6310i and 3510i? If so, where can I find the correct spec? Any other ideas on what might be going on here?