[Bug 1226] New: Support USSD messages, e.g. for "remaining airtime" checks

[bugzilla-daemon at bugzilla.openmoko.org]

http://bugzilla.openmoko.org/cgi-bin/bugzilla/show_bug.cgi?id=1226

           Summary: Support USSD messages, e.g. for "remaining airtime"
                    checks
           Product: OpenMoko
           Version: current svn head
          Platform: Neo1973
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gsmd
        AssignedTo: tick at openmoko.com
        ReportedBy: mail at mmontour.net
                CC: buglog at lists.openmoko.org


gsmd and other related applications should support USSD (Unstructured
Supplementary Service Data) messages from the carrier. This protocol is used
with some prepaid plans to check the remaining balance. For example, with Fido
Prepaid (Canada) I dial "*225" and get a USSD response indicating the answer:

AT+CUSD=1                                                                       
OK                                                                              
ATD*225;                                                                        
OK                                                                              
                                                                                
%CPRI: 1,2                                                                      
+CUSD: 0,"Your balance is $55.15, expiring at 00:01am 15022008 (DDMMYYYY).
Refill before this date to keep your unused balance. Thank you.",15

ATH                                                                             
OK                                                                              

These messages may also appear when a regular call is made, e.g.:

ATD604xxxxxxx;                                                                  
                                                                                
K                                                                               
                                                                                
%CPRI: 1,2                                                                      
+CUSD: 0,"Reminder: Airtime expires soon. Please refill to avoid losing airtime5
                                                                                
%CSQ:  21, 99, 2


There are probably other USSD-related functions that should be supported at some
point, but just passing these messages through to the user's GUI would be a good
start (and would be required for a "consumer-ready" phone).



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