Buying sim cards?

Question

SIM cards

Hello!
I need 20 sim cards, and, most importantly, that they do not have an expiration date. In general, the usual sim cards that everyone uses.
Maybe there are online services? Or maybe you have to buy some kind of sim cards and throw a ruble at them every few months so that they are not blocked?
SIM cards themselves are needed for registration on sites. After registration, they will also request codes sent to the phone, so an eternal service life is needed.
Tell me, please, how to find such SIM cards in general and what should be done with them so that they are not blocked.

Answer 1

All operators now have conditions that they will first withdraw money, and then they will completely block SIM cards if you spend less on SIM cards than specified in the contract.
Issue 20 SIM cards as an individual entrepreneur or use online services to receive and send SMS.
Even in transitions, Beeline SIM cards are often distributed for free. You can use them, but they will be blocked someday