VoicePro Secure
Your carrier cannot read your messages or hear your calls, and we hold no keys to them.A new device gets nothing new until you let it in.In the VoicePro app: included on Mobile+ Ultra, Business+ Elite and Business+ Ultra, or £9.99 a month with a VoicePro SIM.
What it
does
Normal calls and texts cross carrier networks in the clear, and any carrier along the way can read or record them. VoicePro Secure stops that for messages and calls between people using it.
Messages, photos and voice notes are encrypted on your phone before they leave it, with the open Olm and Megolm protocols. Calls are encrypted device to device with DTLS-SRTP. Our servers carry ciphertext. The keys to read it stay on your device.
Encryption is no use if someone can walk in through your account, so that door is shut too. You set 24 words the first time you open Secure, and only you hold them. If someone gets your VoicePro login, or our own server adds a device to your account, that device gets none of your new messages until you let it in, with your words or from a device you already have.
Your phone number stays out of it. People add you by your Secure ID, QR code or link, so you never hand your number out, and a SIM swap gets nobody into your chats.
Lose the words and they cannot be replaced. A device you still have keeps working. A new one can only get in through it, and your history cannot be brought back any other way. We cannot get it back.
The process,
step by step
From your phone to theirs, here is what happens at each step.
Find them
Enter their Secure ID, or open their link or QR code. The chat is encrypted from the moment it is created.
Encrypted on your phone
Each message gets its own key, on your device, before it is sent. The key moves on with every message and the session is regularly replaced.
We carry ciphertext
Our server stores and forwards the encrypted message. It does not hold the keys to your message content. Photos and voice notes are encrypted byte by byte before upload, and their keys travel inside the encrypted message.
Call from the chat
Start a voice or video call from inside the chat, one-to-one or with up to 8 people. The devices agree the keys for that call between themselves with DTLS-SRTP.
Find them
Enter their Secure ID, or open their link or QR code. The chat is encrypted from the moment it is created.
Encrypted on your phone
Each message gets its own key, on your device, before it is sent. The key moves on with every message and the session is regularly replaced.
We carry ciphertext
Our server stores and forwards the encrypted message. It does not hold the keys to your message content. Photos and voice notes are encrypted byte by byte before upload, and their keys travel inside the encrypted message.
Call from the chat
Start a voice or video call from inside the chat, one-to-one or with up to 8 people. The devices agree the keys for that call between themselves with DTLS-SRTP.
Built for
performance
What Secure does today. The limits are further down this page.
Under the
hood
Built on open standards
No home-made cryptography. The protocols are published and the encryption library has been independently audited.
Built for
your operation
For privacy from carriers and the network. Not yet for regulated work.
People who want private chats
Messages and calls that your carrier and the network cannot read, in the VoicePro app.
Get in touchAnyone on a network they do not trust
Hotel wifi, airport wifi, a foreign carrier. Whoever runs the network sees ciphertext, not what you said.
Get in touchAnyone who wants no account at all
Launching soon: open it in a browser and keep your 24 words. No SIM plan, no number and no email for us to hold.
Get in touchTeams on Business+
Private conversations between colleagues, included on Business+ Elite and Business+ Ultra. Not a compliance product: no archive, no recording, no on-premises option.
Get in touchWhat it
doesn't do
Encryption is a precise promise, not a magic shield. Any product that claims to put you beyond the reach of a determined state actor is not being straight with you.
Until you set your 24 words, a device can be added.
Our server can sign in to your VoicePro account in the app. Until your words are set, a device added that way could receive new messages. Set them when you first open Secure and it gets none.
Someone running our server could replace your keys.
Nobody can do it from the app. Anyone who has checked you would be told your keys changed, so checking people is how you catch it.
Both of you need your words set.
Someone who has not set theirs cannot swap messages with you until they do, and what they send has none of this protection. Secure tells you when that is the case.
Who and when is not hidden.
A message needs an address to arrive, so our server sees who contacts whom and when, plus group names and who is in them.
In a browser, you trust what we serve.
The page comes from our website each time you open it. A court order or an attacker that changed that page could get round the encryption. That is true of every encrypted web app.
Lose the 24 words, lose the account.
We cannot get your messages back, and that is the point. Write them down.
Alerts only while it is open.
Secure rings and alerts you while it is open in a browser or the app. With it closed you get nothing until you come back.
It protects the line, not the phone.
Encryption stops your carrier and the network reading you. It cannot protect a device taken over by spyware or left unlocked, which is true of every encrypted app.
Ready to activate
VoicePro Secure?
In the VoicePro app, £9.99 a month with a VoicePro SIM, or included on Mobile+ Ultra, Business+ Elite and Business+ Ultra.