Raspberry Pi 5, 1 GB
- Does
- Under TELRPC Kit OS, it will generate your keys, hold them encrypted, and sign every payment.
- Cannot
- Reach the internet. TELRPC Kit OS will switch its Wi-Fi and Bluetooth off in firmware and carry no networking at all.
The TELRPC Wallet Kit.
Don't want to use an Android phone? Build a self-custody wallet from named parts you can see, check and reflash. With TELRPC Kit OS, which will be published on this page, the keys are born on it, the payments leave it as a phone call, and nothing in it connects to the internet.
Buy the parts yourself from their makers, we list every one below, or buy the complete kit from us. Either way you assemble it yourself, from parts still sealed in their makers' packaging.
$249for the complete kit, every part sealed. Or about $200 in parts, bought yourself.
6
named parts, each sealed by its maker
30 min
to build, one screwdriver, no soldering
0
radios in use beyond a voice call, under TELRPC Kit OS
$25
tracked shipping to 29 countries
Know what is inside your wallet.
In October 2026, buyers of hardware wallets from one reseller reported drained wallets; an on-chain analyst put losses above $86 million, a figure the maker has not confirmed (reported here).
The lesson applies to every device that holds money: know where it came from, and know what is inside it. The TELRPC Wallet Kit is built for exactly that. Every part comes from a named maker, in its own packaging, with its own documentation. You can open it, inspect it, wipe it and reflash it yourself, and check the software against its SHA-256 fingerprint.
Every part, and what it can never do.
Six parts. Each one has a single job, and each one is named, so you know exactly what you are trusting. The computer, display and camera are designed by Raspberry Pi and made in Wales, in the UK. The 4G voice stick is made in China, and it only ever carries signed payments: your keys never reach it.
4G voice stick and SIM
- Does
- Under TELRPC Kit OS, it will place the ordinary phone call, key the signed payment as tones, and read the echo in the caller ID. A 4G USB stick with LTE voice.
- Cannot
- Open a data connection. TELRPC Kit OS will use voice only, and a calls-only SIM makes that physical.
5-inch Touch Display 2
- Does
- Shows every line of every payment before you approve it, and takes your touch.
- Cannot
- Transmit anything. It is a screen on a ribbon cable, with no radio.
Camera Module 3
- Does
- Reads QR codes: the chain state a send needs, an address to pay, a transaction signed elsewhere.
- Cannot
- Send an image anywhere. It reads light into the device, and nothing comes back out.
Card for TELRPC Kit OS
- Does
- Will run the wallet. You flash TELRPC Kit OS onto it yourself and check it against its SHA-256 fingerprint. The TELRPC Kit OS image and its SHA-256 fingerprint will be published on this page.
- Cannot
- Update itself. TELRPC Kit OS will have no online update: a new version will arrive only on a card you check and flash yourself.
Case, power and cables
- Does
- The official case, the 27 W power supply, the antenna and the short cables that join it all.
- Cannot
- Hide anything. Every connection is visible when the case is open.
How it goes together.
About thirty minutes, one screwdriver, no soldering. The kit arrives as sealed parts, not assembled: nothing reaches you that you have not opened, built and checked yourself. Every step is shown here; steps 4 to 7 need TELRPC Kit OS, which will be published on this page.
1. Lay out every part.
Check each part against the list: the maker, the model and the seal on each box. Nothing unbranded, nothing you cannot look up.
2. Seat the SIM in the modem.
Any SIM with calls works; a calls-only, prepaid SIM keeps your identity and the data side out of the picture. Fit the antenna and plug the modem into a USB port.
3. Connect the display and the camera.
Two ribbon cables, each into its own marked connector. Mount the board on the back of the display and close the case.
4. Flash and verify TELRPC Kit OS.
On any computer, write the TELRPC Kit OS image to the card and compare its SHA-256 with its fingerprint. The TELRPC Kit OS image and its SHA-256 fingerprint will be published on this page. This will be the only moment a computer is involved, and the kit itself is never online.
5. Power on. Create your wallet.
Your keys will be generated on the kit. Write the twelve words on paper, check them, and add a PIN. TELRPC Kit OS will encrypt the words on the card under a key that never leaves the device.
6. Sync, receive, top up.
The camera will read the chain state a send needs, or the grid will return it by echo. Show your address to get paid. Top up broadcast credit from any browser at telrpc.com/topup before your first send: 10 cents a broadcast, sync or balance read by call.
7. Pay with a phone call.
Approve the payment on the screen. The kit will sign it, dial the grid through its own modem and key the signed payment as tones. The grid broadcasts it and calls back with the confirmation in the caller ID. No phone in your hand, and no internet anywhere in the path.
What is not in it.
No Wi-Fi in useTELRPC Kit OS will switch it off in firmware and carry no wireless networking.
No Bluetooth in useTELRPC Kit OS will switch it off in firmware, so nothing can pair with it.
No data connectionUnder TELRPC Kit OS the modem will only place voice calls. A calls-only SIM makes it physical.
No app store, no accountNothing to sign in to, nothing installed from anywhere else.
No online updatesNew versions will arrive on a card you verify and flash yourself.
No hidden partsSix named parts, each documented by its maker.
It will work with your hardware wallet.
Already keep your coins on a hardware wallet? With TELRPC Kit OS you will plug a Ledger, Trezor or BitBox02 Multi into the kit with a USB cable, or show a Keystone, Passport or Jade to its camera. The device signs, the kit sends the payment by call, and your keys stay on the device.
Supported devices and coins- A cable or the camera, never Bluetooth, the same rule as the kit itself
- You approve every send on the device's own screen
- The same devices and coins as the TELRPC Wallet on a phone
- The same 10 cents of prepaid credit per send
Ledger, Trezor, BitBox, Keystone, Foundation Passport and Blockstream Jade are trademarks of their respective owners. TELRPC is independent, and not affiliated with or endorsed by any of them.
Source it yourself, or get every part from us.
You do not need us to have this wallet. Every part is listed below with its maker, and TELRPC Kit OS will be free: the image and its SHA-256 fingerprint will be published on this page. Buy the parts, follow the steps above, and it is yours from the first screw. If you would rather not source six parts from different shops, buy the kit from us: the same parts in one box, each still sealed.
Source it yourself
Everything you need. Buy each part from its maker or an official reseller. Budget prices, October 2026, with room for price changes.
| Raspberry Pi 5, 1 GB | about $52 |
| Raspberry Pi Touch Display 2, 5-inch | about $46 |
| Raspberry Pi Camera Module 3 | about $29 |
| 4G USB voice stick (LTE voice, tones and caller ID) | about $35 |
| Raspberry Pi 27 W power supply, case, 32 GB high-endurance card, antenna and cables | about $40 |
| A calls-only SIM from any carrier | yours |
| TELRPC Kit OS image and its SHA-256 fingerprint, to be published on this page | free |
| Parts total | about $200 |
About thirty minutes to build, plus flashing the card. No soldering, one screwdriver.
Or buy the kit from us
For convenience. Every part on the list in one box, each sealed in its maker's packaging. We do not open, assemble or flash anything: you build it and you check it, so the only hands inside your wallet are yours. $249 covers the parts plus our fee for sourcing, packing and shipping.
Kit, sealed parts$249
Tracked shipping, 29 countries$25
Sold out. Tell us and we will let you know when kits are back.
Questions.
Why not just use a phone?
You can: the TELRPC Wallet runs on any Android phone. The kit is for people who want a device built for one job from parts they can name and inspect, with no phone operating system, no app store and no radios in use beyond a voice call.
Why buy from you if I can buy the parts?
Only for convenience. Buying the parts yourself is cheaper, and the result is the same device, which will run the same free TELRPC Kit OS. Buy from us if you would rather get every part in one box than source them from different shops.
Why does it arrive unassembled?
So you can trust it. Every part reaches you sealed by its maker, and you are the only person who opens, connects and flashes it. Nothing has been inside your wallet before you.
Can I wipe it and start again?
Yes. You will be able to reflash the card from the TELRPC Kit OS image at any time and check its fingerprint. Your wallet comes back from your twelve words.
What if I lose it or it breaks?
Your twelve words restore the wallet on a new kit or in the TELRPC Wallet on any Android phone. Keep them on paper, somewhere else.
Which coins does it handle?
TELRPC Kit OS will handle the same coins as the TELRPC Wallet: receive on every major chain, send on the EVM family, Bitcoin, Solana, Litecoin, Dogecoin, XRP, Tron with USDT, Cardano, Stellar, Cosmos, TON, NEAR, Tezos, Bitcoin Cash and Nano.
What does a payment cost?
10 cents of prepaid broadcast credit per payment, never a percentage of the payment, plus the call at your carrier's normal rate (a local call where a local number is live, 15 countries today and 93 on request, or a call to the US line).
Can I use my hardware wallet with it?
Yes, with TELRPC Kit OS. You will plug a Ledger, Trezor or BitBox02 Multi into the kit with a USB cable, or show a Keystone, Passport or Jade to its camera; never Bluetooth. The device signs, you approve each send on its own screen, and the kit sends it by call, so your keys stay on the device. The supported models and coins will be the same as in the TELRPC Wallet: see the table.
Is it for institutions too?
Yes, as a signing appliance for a treasury: the same kit, with its signing addresses allowlisted on the TELRPC Console. See institutions.