Oddbean new post about login | logout @blockstream satellite fixes this. It’s not that hard to set up and there’s even a chance you have most of the required equipment sitting disused on your home.
I should be clear: this is for getting blockchain data to feed your node. Sending your 250 byte transaction without internet was fixed years ago…I haven’t done this in a long time but there may still be an sms relay for bitcoin transactions. It takes two sms texts to send a tx.