This subject has been discussed at length elsewhere. To reiterate and summarise: there is absolutely no infallibly effective way for any network to block scammers, regardless of where they're from ( or appear to be from ) or whether or not they use VOIP. The BT4600 is, as stated, an effective solution, if you like that phone. If, like me, you use the phone quite a lot, you may well have specific preferences as to what kind of phone you do or don't like to use. If, like me, you happen to have a preference for the old-school ( very old-school ) types of telephone, there is no choice but to take what precautions can be taken, and deal with whatever scammers do get through as you see fit. To be clear, though, although I'm not one of BT's biggest fans, I can tell you that switching providers absolutely will not solve your problem, no matter who you switch to or what claims they make.
