SMS is trickier as I only know enough programming to write a script in bash to send sms. I can't send pictures or videos, so I try to convince friends to use signal instead.
911 works with no sim card, as required by federal law.
I do have working SMS to email however, so viewing SMS is a piece of cake :)
I have an Anveo call flow[1] that implements a white/grey/black list setup that works great. There were a couple really persistent callers that I had to block the entire NPA NXX which is harder for the caller to spoof. I get almost no robocalls.
$3/month gets you an US/Canada phone number that you can make/receive voice calls using SIP, and send/receive SMS using XMPP.
'Sorry, you will need to contact sales to order an 07 mobile number at this time.'
It would be cool to get back on a mobile carrier, but only if I had enough network control to handle the kind of hacking attempts in the article
It seems this would solve the hijacking issues but you’d still likely get bombarded with robo calls to the MVNO number.
Does your setup have any mitigation against robo calls for the anveo number?
What do use for dialing? I’m wondering if it would somehow be possible to disable the device phone app to disable getting nuisances from the MVNO number.
I’m very interested in a write up. Thanks for sharing!
presumably all his calls are done through a VOIP app (he said astrix so probably SIP) and he can ignore all "normal" incoming calls, or is forwarded to his phone using a known number and he can ignore every number except that one.
In the scenario where you use a cheap cell plan to have an always on data connection to the the PBX you will have to have some method of blocking all of the calls to the device number. I suppose you could have them all forward to the PBX and then your filtering could apply.