There's a website that let's you send SMS anonymously (if that's what you are asking). Source: almost 3 years ago

Checkout https://pushover.net/ I paid $5 once, years ago, and can push notifications to my phone from my custom little self-hosted stuff. - Source: Hacker News / 4 months ago

Am I understating this correctly … If you self-host & have more than 10 users, there is no option for you to use another push notification service (like https://pushover.net/) You either pay for zulip or don’t get push notifications. - Source: Hacker News / 6 months ago

Looks great, what differentiates ntfy.sh from https://pushover.net/ ? - Source: Hacker News / 6 months ago

So you’ve just set up OpenWRT with all the bells and whistles only to realize there is no out-of-the-box way to receive notifications for newly connected devices. No worries! With this tutorial, we will set up our OpenWRT server to send notifications to Pushover whenever a new device is connected to the server. - Source: dev.to / 6 months ago

You can have calls redirected on Twilio to another number easily by using a "Twimlet" which is a pre-built "TwiML" (Twilio's XML markup) generator. https://www.twilio.com/labs/twimlets I use the "Forward" one for calls. For SMS, it used to be not too complicated - I would host a file directly on Twilio (using a Twilio bin) to forward the SMS to another number. Recently, sending out SMS's has become a lot more... - Source: Hacker News / 10 months ago