How to make a SIM card eternal and avoid blocking?

Question

SIM cards

Actually, the future has come, but a relic of the last century in the form of sim cards still rule our lives.
For the most part, I don’t need sim cards, but a lot of services, banks and other crap are tied to them.
Some I use once or twice a year.
The question is how to reliably keep sim cards working and not get a lock from the operator for not using them.
It's clear that I'm sitting on tariffs without a subscriber, there are a lot of sims. Willing to spend a small amount of money on maintenance, for example, 10-50 rubles a year. Sims are not available, that is, I am more often on the other side of the world than next to Sims.
Who does it, or did everyone score and cave in under the operators?

Answer 1

As a rule, in almost all opsos, the operating time of the SIM card during inactivity is 180 days. Once every half a year, send a paid SMS and you can forget.

Answer 2

I'm using a corporate plan. Including it has "silent" sim-cards for years. Naturally with tariffs without a subscription fee. Some sims are silent from the moment of purchase *
Naturally, this does not guarantee that in 150 years these cards will remain working, as well as the very existence of the
opsos

Answer 3

Once every 3 months, send SMS, alas .
Have an appropriate operator (I have MTS).
In general, there is a tendency that active SIM cards (that is, just connected to the network) will not be blocked. If you take it out of the device and put it on a shelf, then after a while they will be blocked, you can’t get away from this, because. people are dying, and the numbers are few at all.

Answer 4

Top up once a year for a minimum amount.