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here's what i want to do:

store my private key on an offline phone. use that offline phone to generate a signed transaction and generate a QR code for me to scan/broadcast with my online phone.

does this exist?!? i cannot find an app to do it

seems like the most secure/convenient way to use bitcoins.

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    Beware: phones are built for connectivity. To make a truly offline device you'll want to take extra steps to ensure you remove all connective functions (wifi, bluetooth, etc) from the device. Otherwise this is a reasonable idea, though I'm not sure what software is mobile-ready to display signed transactions in the way you need.
    – chytrik
    Jul 3, 2018 at 19:15
  • that's a good tip. i thought even if i have 100 virus on my phone it won't matter because it'll never go online. but what if the virus re-enables online o.o also i need to make sure to encrypt phone's data, just in case it's stolen there's no keys on the drive
    – Farzher
    Jul 4, 2018 at 3:14

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electrum android app can do this! check it out, it's perfect! also seems like a nice wallet with a lot of features.

your watch-only online electrum can create an unsigned transaction with QR code. your offline electron can scan then sign it & generate a QR code for you to broadcast with online electrum!

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  • i recommend using multisig instead. same idea, just an extra level of security by also requiring the key from your online phone
    – Farzher
    Jan 25, 2019 at 7:25

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