How can I check the status of a GSM phones divert and call waiting?
The following codes are specified in the GSM specification and thus should work from any GSM phone: • *#21# to check number for “All Calls Divert” • *#67# to check number for “On Busy Divert” • *#61# to check number for “On No Reply Divert” • *#62# to check number for “Divert if unreachable (off or out of range) • *#43# to check call waiting status.