SMS notification for missed calls while phone was off network

@syaoran It’s been a standard service in European mobile networks (probably elsewhere, too) for more than a decade. When someone dials my mobile number, my home network gets a call request no matter whether my device is currently connected to that network or not. So the network operator knows that somebody tried to call my number – and could thus notify me later.

I’m dumbfounded that it’s not offered here, T-Mobile support just confirmed they don’t have it in the US. But then again, I’d never heard of a mobile operator limiting video resolution, blocking international calling or asking extra money for hotspot usage before coming to the US, despite the prices here being exorbitant compared to European networks. (I would have paid much less for a European Global Unlimited 5G plan than for a US national 5G Unlimited Plan.)