Bitcoin Keeper is a mobile wallet software that can be downloaded from the Google Play and iOS app stores. Keeper supports all major hardware wallets and offers intuitive DIY single and multisignature wallet coordination. Keeper also supports single hot wallet functionality and own node connections.
This video walks you through pairing Passport with Keeper in a 2-of-3 multisig setup. Keeper calls this the 'Hodler' plan. Written steps can be found below.
Tap Start New
On the next screen, tap 'Pleb' in the top left corner and change your plan to 'Hodler'
Tap Add Now
Choose Add 1st Signing Device
Choose Foundation from the list, then tap proceed
Navigate to the account you want to connect, then choose Manage Account > Connect Wallet > Keeper > Multi-sig > QR code
Present the animated QR codes being displayed by Passport to the camera on your phone
Add the other two keys. These can be additional Passports or any other key type from the compatible list in Keeper
After the vault is created, tap on Passport from the displayed key list
Choose Advanced Options > Manual Registration
Scan the animated QR codes being displayed by Passport
Confirm the multi-sig wallet details on Passport to finalize the import
Navigate back to the main vault screen and tap Receive
Scan the receive address QR code being displayed by Keeper and look for a teal colored check mark to confirm successful connection
From the main vault screen, tap Settings > Generate Descriptors
Save a copy of this on an SD card or USB drive somewhere secure. Common practice is to store a copy of this with each seed backup.
This file will help you reconstruct the multisig wallet in the event that you lose a key and it's corresponding seed backup.