I thought bad guys could get your SMS only if they manage to clone your SIM or call provider to change the SIM by social engineering. In both cases service on m

I thought bad guys could get your SMS only if they manage to clone your SIM or call provider to change the SIM by social engineering. In both cases service on my SIM will stop. Unless they are state sponsored, in which case they can just arm twist telecom provider to give them texts. Could you please tell how they can sniff SMS without user ever noticing?