Yep many mobile providers keep tightening their spam algorithms that will delay SMS or stop SMS. It has been happening for quite some time.
Most of us have quit using SMS with BI for this reason.
Many of us use the Pushover app ($5) so that we get push notifications with an image whether we are home or not. That way you don't have to VPN unless you get a push that warrants you pulling up the video.
Either get the BI app to receive push notifications ($10) or do what most of us have done and get the pushover app ($5). The advantage to the pushover app is you will get pictures when away from your home. With the BI app, you will only get pictures with the push if you forward ports or have an ongoing VPN connection back to your system.
I've figured out how to send Pushover notifications with pictures and hyperlinks from
Blue Iris Actions without using external scripts. This approach uses curl and the Pushover API, and provides functionality similar to that recently described for Telegram . EDIT (5/16/2022) - For those who...
ipcamtalk.com