Zte A139+ User Manual page 29

View all calls by pressing the Dial key.
View Name by pressing the Right soft key.
All the numbers in the lists can be directly dialed by pressing the Dial key.
Press the Dial key to answer an incoming call. For other answer modes please
refer to User Profiles-Answer Mode. If you won't answer the call, press the End
key or press Reject to send busy tones to the caller.
Call Menu
In the in-call mode, you can enter the call menu by pressing Option. Call menu
can be seen only in the process of communication. The functions such as Call
waiting, Call keeping, Multiparty require the network support.
Note: Some menu items can only appear in special cases. Menu items such as
Swap will appear only when the ongoing call and the hang-on call coexist.
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