[alpb]

Not if you live in a surveillance state such as many middle-east countries.

Many Telegram accounts were compromised in Iran a while ago because of this. https://www.wired.com/2016/08/hack-brief-hackers-breach-ultr... Similarly I know for a fact that in many countries your GSM provider stores your texts so you can view/reply them from their web portal. (As you can imagine despite an attacker might not have your SIM card, they might find your user/pass to log in your GSM provider's portal.)

Also state-sponsored actors do tap into GSM operators since SMS is not end-to-end encrypted. Add this to the previous attack vector and you'll see that wiretapping inbound SMS is surprisingly not that hard.

[azernik]

Resistance to state actors is a pretty high bar.