Another simple way (from my experience)
Use BlueWallet,
  • Scan the QR code (bitcoin address)
  • enter the amount sats
  • After selecting the fee etc, the next screen you'll see a share button which contains a signed transaction hex, which you can share with the other person who has an active internet connection via SMS, NFC, or airdrop etc,
  • And they can broadcast to the Bitcoin network.
Yeah, presigned Bitcoin transaction. I never knew getting it was so easy. Thanks!
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