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Getting Started with HC15

3.5 Selecting UMTS or GSM

HC15_startup_v02 Page 20 of 36 2007-2-16

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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. Setting <mode> to 0 without choosing a spe-

cific <act> enables the automatic selection mode once again.

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.

AT+COPS?

+COPS: 0,0,"T-Mobile D",2

Querying the current network mode.

The ME is registered to the German operator T-

Mobile and uses UMTS.

AT+COPS=0,,,0 #(or AT+COPS=,,,0)

AT+COPS?

+COPS: 0,0,"T-Mobile D",0

AT+COPS=0,,,2 #(or AT+COPS=,,,2)

AT+COPS?

+COPS: 0,0,"T-Mobile D",2

AT+CPIN?

+CPIN: READY

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.

AT+COPS=0

Setting automatic network selection mode.

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