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The Israeli government did not tamper with the Hezbollah devices that exploded, defense and intelligence officials say. It manufactured them as part of an elaborate ruse.

https://www.nytimes.com/2024/09/18/world/middleeast/israel-exploding-pagers-hezbollah.html

Rasberry Pis and similar are sometimes sold as credit-card sized, but they are not portable, really, have huge Ethernet ports and no display or keyboard. Those are on the too-big side for what i am looking for.

In the other hand, you could say that SIM cards or USB devices are technically computers, but they lack a user interface. They are too small.

Is there something small with a usuable display and input method; something that looks like a calculator or tiny smartphone? Does not need a battery (although that's a plus). Does not need WiFi or 5G (although that's plus). Needs some standard method to communicate with the outside world (USB, Bluetooth, NFC, Wifi, ...). Should easily fit in a pocket, wallet, purse.

Ideally something that can run a minimal Linux or Android?

So, I need text messages from my secondary phone -- either on my primary phone (both Android, both Samsung Galaxy) or on a web-based service.

The forwarding must be near-instant. I can wait a few seconds; maybe a minute, but not two. The setup must be reasonably secure and reliable.

I'm looking for a trustworthy app; willing to pay, but would prefer free trial to see it really works. I don't want to send all my message unecrypted through some server in someone's basement, but I'd consider a professionally run service. E2E is gold, but must be practical.

Twilio will abandon Authy desktop, a good opportunity to switch to an open-source app. That is if you manage to export the tokens from Authy. Without a convenient export, many users will be stuck.

The guides you can find online require an old versions of the desktop app. Is there a known way today? Do we know how/where Authy stores the secrets on-device?

KI doch klüger als der Mensch