Well, this issue was actually trickier than it looks. The real problem is the protocols our communication infrastructures built on was designed without almost a

Well, this issue was actually trickier than it looks. The real problem is the protocols our communication infrastructures built on was designed without almost any authentication & authorization mechanism. It wasn't a big issue when it designed as copper wires were required to make calls but it means basically anyone get those endpoints details can send SMSes, make calls claiming to whoever they want given now almost everything is on IP network. Yes you were right about that those telcoes do know what was the problem and how to fix it but they simply have no incentive to fix it as: 1. it needs overhaul of the current infrastructure, which needs lots of money and effort to proceed. 2. It requires all parties in the network to coordinate. One single exception means the issue remains or you will have to drop interconnection with those are not ready yet. 3. Negative impact to their revenue. So here comes the status quo.