Selecting Umts Or Gsm - Siemens HC15 Getting Started Manual

Getting Started with HC15
Confidential / Preliminary
3.5

Selecting UMTS or GSM

The GSM 07.07 operator selection command AT+COPS has been enhanced to enable the
subscriber to select whether to use UMTS or GSM. You can quickly switch back and forth
between both network types while the ME remains registered.
Write command: AT+COPS=<mode>[, <format>[, <oper>[, <act>]]]
The parameter <act> (access technology) can take the values listed below. The parameter is
stored non-volatile.
0 GSM network
2 UMTS network
Note: By factory default, an automatic network selection mode is set which enables the ME
to select either UMTS or GSM, depending on the network coverage. This automatic mode
remains enabled until you explicitly set either UMTS or GSM using the <act> parameter of
AT+COPS. Setting the <act> parameter forces the ME to select either UMTS only or
accordingly, GSM only. If the specified network is not available, the network registration will
be disabled.
at+cops?
+COPS: 0,0,"T-Mobile D",2
OK
at+cops=0,,,0
OK
at+cops?
+COPS: 0,0,"T-Mobile D",0
OK
at+cops=0,,,2
OK
at+cops?
+COPS: 0,0,"T-Mobile D",2
OK
at+cpin?
+CPIN: READY
OK
Furthermore, the command AT+COPS serves to query or specify several modes of selecting
the GSM network operator. These functions are not discussed in this document.
HC15_startup_v01
#(or at+cops=,,,0)
#(or at+cops=,,,2)
Page 17 of 31
Querying the current network mode.
The ME is registered to the German
operator T-Mobile and uses UMTS.
Selecting the GSM network.
Query the current network type.
The response confirms that the ME has
changed to the GSM network.
Selecting the UMTS network.
There is no need to enter the SIM PIN again.
s
2007-01-22