Thanks for your answer, Jimmack.
But, if I use MIDP-2.0, can it be done?
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Question
How to block SMS using J2ME?
Hi,
I'm trying to build an application that can block incoming message.
I use J2ME. Can J2ME do this? I mean block incoming message from all number?
(I hope the incoming messages are not stored in the inbox folder)
I have read that SMS sent using port number. What port number is usually used to sending
and receiving message.
I use Nokia 3650 phone (MIDP 1.0)
Could anyone give me advice?
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Answers
Can you explain why you need to do this. It depends on what ports the SMSs are received. Even then, the J2ME implementation should inform the user that an SMS has been received. You'll certainly need to ask the user if they want to do this for both useability and (more importantly) security reasons.
I use this application for my thesis. I think it was simple to block SMS using J2ME before. But when I tried to implement it, I know I was wrong.
If it depend to the port, which port is usually used to receive SMS? Does any ways to do this (block incoming SMS) using J2ME?
thanks before Jimmack for your answer, It's very help me.
Unfortunately, I don't have a MIDP-2.0 compliant handset at the moment, so I can't do any testing to prove the following, but...
A table appears in the WMA 1.1 specification (Table A-1: Number of SMS protocol messages needed for different payload lengths) with the following headings:
No port number present (message to be displayed to the end user)
Port number present (message targeted at an application)
This implies to me that "normal" SMS messages (eg. sent from any other handset using the normal "Message" facilities) will not contain a port number.
In order for an SMS to be recognized by a MIDlet, the MIDlet needs to register with the PushRegistry. When registering, a port needs to be specified.
This therefore implies that "normal" (handset -> handset) SMSs cannot be intercepted. This makes sense because where a MIDlet does receive an SMS, the SMS is deleted from the SIM/ME and responsibility for storing the contents is left to the MIDlet. Potentially, there is a security/useability risk where a MIDlet is installed that simply intercepts and discards all SMSs (without informing the user).
At this stage, I would think that you cannot intercept and manage all SMS messages using J2ME.
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by: jimmackPosted on 2004-02-04 at 02:22:21ID: 10269650
Sorry, no. You can't do anything with SMS or anything with the phone or SIM using MIDP-1.0.