ZTE Blade III Manual Do Utilizador

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You can set the length of Dual-tone multi-frequency (DTMF) sig-
nal tones.
1.  Touch the 

2. Touch 

Normal or Long.

You can touch and hold the 1 ~ 9 key from the dialer to call the 
corresponding speed dial number.
The number key 1 is reserved to speed dial your voicemail.
To assign a speed dial key:
1.  Touch the 

2.  Touch a speed dial key.
3.  Enter a phone number or select one from the contact list.
4. Touch 

Call  barring  feature  allows  you  to  forbid  certain  types  of  calls 
from your phone.
1.  Touch the 

2.  Set the restriction of specific types of calls from your phone.