Into the actual composer for SMS or Mobile push the contact sources is automatecally established with the Database that it used for this channel.

It should not to be in this way since many users "forget" to change the Contact Source and accidentally send the message for entire DataBase.

I think that Contact Source must be empty and the user forced to establish it. I understand that it is 1 more step, but in practice is rare that the user need to send a mobile message for the entire DataBase (or al least all Optedin SMS phone numbers, er even all users for a particular app or app group), so they make this aditional step.

i am pretty sure that all user select a query with a reduce number of contact that must receive the message.