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Understanding the GSM Profile
To allow data calls to a GSM network, you must obtain the following information from your service provider:
- Username and password
- Access point name (APN)
- Whether the authentication is CHAP or PAP
You configure this information in a GSM profile associated with the 3G wireless modem physical interface. You can configure up to 16 different GSM profiles, although only one profile can be active at a time.
 | Note: You also need to configure a CHAP or PAP profile with the specified username and password for the dialer interface. |
Subscriber information is written to the Subscriber Identity Module (SIM) on the GSM HSDPA 3G wireless modem card. If the SIM is locked, you must unlock it before activation by using the master subsidy lock (MSL) value given by the service provider when you purchase the cellular network service. See Unlocking the GSM 3G Wireless Modem.
Some service providers may preload subscriber profile information on a SIM card. The assigned subscriber information is stored in profile 1, while profile 0 is a default profile created during manufacturing. If this is the case, specify profile 1 for the GSM profile associated with the 3G wireless modem physical interface.
