A lot of people fall prey to scammers using SMS texts. There is a very simple way to stop them. Currently, all mobile service providers allow SMS texts to be sent from any mobile to one or more other devices, irrespective of the contents of the SMS.
If every mobile service provider allowed all customers to create a contact list in their account, basically copy the contacts list on their phone into their service provider account, excluding names of contacts. If I am sent a scam SMS, have the network check the scammer's mobile number against my contact list of numbers. If there is no match, the scam SMS should never reach its destination, my phone. If the network is able to do this, no more scam SMS.