Nokia 6131 NFC

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You may assign a default function to the PTT (volume up) key to open 
the channel list, the contacts list or a single channel or contact. See PTT 
settings p. 87.
To disconnect from the PTT service, select 
Switch PTT off
.
■ Make and receive a PTT call
Warning: Do not hold the device near your ear when the loudspeaker is 
in use, because the volume may be extremely loud.
To make a channel call, a one-to-one call, or a call to multiple 
recipients, you must hold the PTT (volume up) key as long as you talk. To 
listen to the response, release the PTT (volume up) key. Talking is allowed 
on a first-come, first-served basis. When you stop talking, the first 
person to press and hold the PTT key can talk next.
You may be able to check the login status of your contacts in 
Menu
Push to talk
Contacts list
. This service depends on your network 
operator and is only available for subscribed contacts. To subscribe a 
contact, select 
Options
>
Subscribe contact
, or if one or more contacts 
are already marked 
Subscribe marked
.
 or 
 indicate that the person is either available or unknown. 
 indicates that the person wants not to be disturbed, but can receive 
callback requests. 
 indicates that the person has PTT not switched 
on.
Make a channel call
To make a call to a channel, select 
Channel list
 in the PTT menu, scroll to 
the desired channel, and press and hold the PTT (volume up) key. A tone 
indicates that the access is granted, and the phone displays your 
nickname and channel name.
Make a one-to-one call
To start a one-to-one call from the list of contacts to which you have 
added the PTT address, select 
Contacts
Names
 or 
Menu
Push to 
talk
Contacts list
. Scroll to a contact, and press and hold the PTT 
(volume up) key.