Philips 535 manual Operator services, GSM strings, Dtmf tones, Pause and wait characters

15 • Operator services

Most items of the Operator Services menu (e.g. Service numbers, Services +) are subscription-dependent and specific to operators: your mobile phone readily sup- ports them if they are included in your subscription. Consequently, the menus shown following may or may not be available. Contact your network operator for detailed information on availability and rates.

The services provided may involve making a phone call or sending a SMS for which you may be charged.

GSM strings

The phone supports standard GSM strings that can be sent from the keypad to the network and used to acti- vate services provided by the network.

•Example n° 1

Press *43#, then (, to activate the Call Waiting service.

•Example n° 2

Press *#31#, then (, to know if the mobile identification has been sent.

•Example n° 3

Press *61#, then (, to activate the feature call forward if no reply.

•Example n° 4

Press *62#, then (, to activate the feature call forward if unreachable.

Contact your network operator for detailed informa- tion on GSM strings.

DTMF tones

Some phone services (such as phone answering ma- chines and pagers) require your phone to transmit DTMF tones (Dual Tone Multi Frequency), also known as “touch tones”. These are used to communi- cate passwords, callback numbers, caller choices, and so on.

You can send DTMF tones at any time during a call by pressing any of the keys 0to 9, *and #. You can also attach a DTMF sequence to a phone number before dialling it (or storing it in the Phone- book). The phone number and the DTMF part must be separated by a wait character.

Pause and wait characters

To obtain a pause or wait character, press and hold

#. The display shows w for a wait and p for a pause. The phone always interprets the first pause character as a wait character. When you dial a number containing a wait character, your phone dials the first part (the

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