TL;DR
Nunchuk’s phone app can show and coordinate a 2-of-3. The free plan is enough for a do-it-yourself multisig; paid plans add a key held by Nunchuk and inheritance features. On the phone, hardware wallets connect by NFC or QR code, so the USB devices from the setup guide still sign on a computer. I haven’t used Nunchuk in this setup myself: this follows Nunchuk’s own pages and app source, checked October 2026.
Who this is for
You like the guide’s setup, but you want to see your balance or prepare a payment from your phone. Or you’d rather have a coordinator in your pocket than on a laptop. Nunchuk is the best-known app that does multisig on a phone, and it uses the same open standards as Sparrow. For the head-to-head comparison, see Sparrow vs Nunchuk.
Free vs paid
| Plan | Price | What you get |
|---|---|---|
| Free | $0 | Your own single-sig and multisig wallets, all keys yours |
| Iron Hand | $120 a year | Assisted 2-of-3: two keys yours, one held by Nunchuk on its server |
| Honey Badger | $480 a year | Two assisted 2-of-4 wallets with three of your keys, plus inheritance planning |
| Honey Badger Premier | $2,100 a year | Assisted 3-of-5 wallets, multi-person use, two inheritance keys |
Prices as listed on nunchuk.io in October 2026; they change. Everything in this article uses the free plan. The paid plans are a different model, closer to collaborative custody, and need an account.
You don’t need an account for the free plan. In guest mode, the app says keys and wallets are stored only on the phone until you delete them or uninstall the app.
Which hardware wallets work on the phone
This is the part that changes the plan most. Nunchuk’s FAQ says keys that need USB are added from the desktop app, and that the desktop app supports BitBox, Coldcard, Jade, Ledger and Trezor, some of which also work on the phone over Bluetooth, NFC or QR. In the source code of Nunchuk’s open-source Android app I found NFC support for TAPSIGNER and Coldcard, and QR support for Keystone, SeedSigner, Jade and Passport. I found nothing for the Trezor, BitBox02 or Ledger.
| Device | On the phone | On Nunchuk desktop |
|---|---|---|
| Trezor Safe 5, BitBox02, Ledger Nano S Plus | Not that I could confirm | USB |
| Blockstream Jade | QR | USB |
| Keystone 3 Pro | QR | Not checked |
| Coldcard | NFC | USB |
The iPhone app isn’t open source, so for iOS I only have Nunchuk’s own description. Check the current app before you buy anything for it.
So with the guide’s three USB devices, the phone can watch the wallet and prepare transactions, but signing still happens on a computer, in Sparrow or in Nunchuk’s desktop app. To sign from the phone you need devices that do QR or NFC, such as a Jade or a Keystone. Thinking of a Coldcard for that? Read the July 30, 2026 weak-seed incident on security alerts first.
Open your Sparrow wallet on the phone
A wallet you built with the setup guide moves over through its descriptor. No seed words are involved, and the phone gets no private keys.
- Install Nunchuk from the official app store, from the developer named Nunchuk, and choose guest mode.
- Get the descriptor file from step 7 onto the phone. It isn’t secret, but anyone who sees it can follow your balance, so avoid email and chat apps.
- In Nunchuk choose Recover existing wallet, then Recover via BSMS/descriptors/config file, and select the file.
- Check that the first receive address in Nunchuk matches the first one in Sparrow. If it doesn’t, stop: the file or the import is wrong.
What you get is a watch-only copy: same addresses, same balance, no signing power on the phone.
What’s different from the guide
- A phone is a busier device. It runs many apps and is always online. That’s why the guide uses a laptop that does nothing else (step 2).
- The phone’s screen is not your check. An address shown in the app proves nothing on its own. Before you hand out an address, check it on a device that has your multisig registered, as in step 8.
- Don’t add a phone key. The free plan lets you create a software key on the phone. A key on a phone is a hot key; it doesn’t belong in a wallet built around three hardware wallets.
- Registrations live in each app. Sparrow keeps the Ledger’s registration in its own wallet file. Expect to approve the multisig on the Ledger again if you sign from Nunchuk’s desktop app.
- Backups stay the same. Three seeds on metal and the descriptor with each one. Nunchuk saves its own wallet file (BSMS); it describes the same wallet.
Common mistakes
- Buying a phone setup around the Trezor, BitBox02 or Ledger and then finding they won’t connect to the phone.
- Signing up for a paid plan when all you wanted was a balance on your phone.
- Giving out an address straight from the phone app without checking it on a device.
- Sending the descriptor through a chat app that keeps a copy on its servers.