Question

I’m going to develop app that will need to detect the caller number and be able to drop the call. I’ve got several various j2ee midp2 enabled phones I want to use for this, but I can’t find j2me API that is able to provide me the caller number and/or manage the call state (drop it).

On Android there is PhoneStateListener, so app can listen to incoming calls and deals with it.

Since the application is not for resale / distribution (I am not bound to mobile phones but only to the GSM network) I can use also some reasonably priced industrial-grade solution too.

So the Q is: is there any possibility to detect caller details in j2me or I just have to trash all my available Nokia phones and buy some low-end Android stuff instead?

Answer 1

currently, low-end Android stuff seems like the way to go.

• There is JavaME API specification for stuff like that (JSR 253 Mobile Telephony) but I am not aware of any real phones that support it

The Mobile Telephony API allows java applications to access
call-related functionality such as:

• Initiate voice and emergency calls
• Receive/accept an incoming call
• Control and end an existing call
• Receive event notifications of call state changes
• Receive event notifications of network state changes (e.g. roaming
  to a different network)
• Access network information such as Network ID and “Network Selection
  Modes”
• Use supplementary services such as multiparty calls, and call
  forwarding
• Get status information about supplementary services
• Activate/deactivate supplementary services
• Send/receive Unstructured Supplementary Service Data
• Manage call-related phone and user parameters such as “Phone
  Identity Presentation Restriction” or “User Group”