If you are interested in setting up your own SIM card testing station - how good are your Unix/Linux command line skills? These skills are the key required ingredient - the needed hardware (HID Omnikey 3121 or equivalent) is dirt cheap from ebay/amazon/etc.

That being said, less than a month ago (ordered July 20, delivered July 25) I bought 20 of these current Speedtalk SIMs:

https://www.amazon.com/dp/B01N9XPPGZ

I just tested them today, and guess what: they are still good, just like the ones I bought back in early 2021! These SIMs now sell on Amazon (at the above link) for $0.99 apiece - yes, that's right, 99 cents, and if you buy some now (as opposed to waiting another year or however long), you will get SIM cards that will be good for any ancient GSM/2G phone! So for anyone who has been wanting to use a 2G phone in direct defiance of T-Mobile's anti-2G policy and edicts: the time to jump on the deal is now. Once you buy one of these SIMs (I recommend buying a stash for yourself and your family) and are ready to activate a GSM/2G phone, just ask me if you need further guidance or assistance.

Yes, I know that the description says "This SIM card is only compatible with 5G and 4G LTE phones" - buy you just ignore that edict, and stick the SIM into your beloved GSM/2G phone as an act of civil disobedience - it will work!