I'm getting messages from organisations or websites who does not have a phone number. I mean messages from TD-MAN, LM-058457 etc. Is there any way to block messages from these sources. I'm from India.
If you own a Nokia you can use the call and sms filter
Go to Settings -> Call & SMS filter
in this app you can select specific numbers that should be blocked and in advanced settings you can also block withheld numbers.
I'm from Europe so don't know if these Indian (non digit sender) sources are easily blocked as well because we don't have them in Europe but it should help you at least a little bit.
some screenshots here:http://allaboutwindowsphone.com/flow/item/18112_Nokia_adds_call_and_SMS_blocki.php
If you dont have a Nokia phone but HTC, Samsung or any other device there is no option.
I'm not sure if this worked but I think it did. Contact you provider and ask them to block these texts and calls. I did this by text to Vodafone and it seemed to work.