RelayBridge4iOS

Turns a spare jailbroken iPhone into a Continuity relay device, like an iPad or Mac. Your main iPhone forwards SMS and phone calls to it, and iMessage keeps working normally.

Works

• Send and receive SMS (green bubble) through your main iPhone
• Receive MMS picture texts
• Make and receive phone calls through your main iPhone
• iMessage and FaceTime, including photos

Not supported

• Sending MMS picture texts (send pictures over iMessage instead)
• Moving a call that's already in progress from your main iPhone

Setup

1. Remove the SIM from the jailbroken iPhone.
2. Install RelayBridge4iOS.
3. Settings → Messages: turn iMessage off, then on.
4. Settings → FaceTime: turn FaceTime off, then on (same Apple ID as your main iPhone).
5. On your main iPhone: Messages → Text Message Forwarding → turn on this iPhone, and Phone → Calls on Other Devices → Allow → turn on this iPhone.

Privacy & security

• No network access. RelayBridge4iOS never connects to the internet, sends data anywhere, or reads your IP address, MAC address or other network info.
• No personal data in the package or source. No names, emails, device identifiers or file paths. Packages are built on GitHub's servers from the public source.
• Apple's encryption is unchanged. It only answers one question differently inside a few Messages and Phone processes: "Does this device have cellular?" It answers "no", like an iPad. SMS and call relay still use Apple's end-to-end encrypted Continuity connection. RelayBridge4iOS never sees message content, call audio or encryption keys.
• No one else gets new information. Apple sees the same kinds of things it sees from any of your devices; nobody else sees anything.
• Debug logs stay on your phone, are off by default, are never uploaded, and show device identifiers as <redacted>.

Keep your jailbroken phone secure: set a passcode, change the default SSH passwords (passwd and passwd mobile as root), and only install tweaks you trust.

Compatibility

• Tested: iPhone 8 Plus, iOS 16.7.15, palera1n (rootless)
• Expected to work: iOS 15–16 rootless (palera1n, Dopamine). Please report.
• Beta: iOS 14 rootful (unc0ver, Taurine, checkra1n). Untested.

The jailbroken iPhone must have no SIM and use the same Apple ID as your main iPhone.