Is it possible to intercept outgoing SMS before it is actually sent, get its contents then ignore / send it according to some criteria?
eg. block all international text (numbers with leading 00), but allow everything else.
First of all, your SMS messages can easily be intercepted by law enforcement, security services or other parties if your phone is bugged.
Step #4 Intercept Text MessagesYou can use it both from mobile phone data and Wi-Fi. You will be able to intercept the text messages of the target phone. The app will notify you about incoming and outgoing text messages. It even shows you the timestamp and the attachments of the texts.
Mobile phone spy apps are software packages that are capable of forwarding texts to another phone remotely. With these applications, you can access all texts sent and received by your husband or child as well as those that are no longer on the device.
When you add an Exchange account using ActiveSync on an Android phone, some phones will begin forwarding a copy of every SMS message (e.g., text message) that the phone receives to your email account. This feature will vary from phone to phone. To disable this feature: On the phone, open the Email application.
Incoming SMS
You can intercept an incoming sms thru sms listener using Broadcast receiver.You can modify the incoming sms or destroy it so that it does not reaches inbox.
Outgoing SMS
You can listen for outgoing sms by putting content observer
over content://sms/out
but you can not modify it with the native sms app.You can obviously modify the content of content://sms/out
but it has no point.
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