Apple Platform Security
- Welcome
- Intro to Apple platform security
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- System security overview
- Signed system volume security
- Secure software updates
- Operating system integrity
- Activating data connections securely
- Verifying accessories
- BlastDoor for Messages and IDS
- Lockdown Mode security
- System security for watchOS
- Random number generation
- Apple Security Research Device
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- Services security overview
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- Apple Pay security overview
- Apple Pay component security
- How Apple Pay keeps users’ purchases protected
- Payment authorization with Apple Pay
- Paying with cards using Apple Pay
- Contactless passes in Apple Pay
- Rendering cards unusable with Apple Pay
- Apple Card security
- Apple Cash security
- Tap to Pay on iPhone
- Secure Apple Messages for Business
- FaceTime security
- Glossary
- Document revision history
- Copyright
iPhone Text Message Forwarding security
Text Message Forwarding automatically sends SMS text messages received on an iPhone to a user’s enrolled iPad or Mac. Each device must be signed in to the iMessage service using the same Apple ID account. When Text Message Forwarding is turned on, enrollment is automatic on devices within a user’s circle of trust if two-factor authentication is enabled. Otherwise, enrollment is verified on each device by entering a random six-digit numeric code generated by iPhone.
After devices are linked, iPhone encrypts and forwards incoming SMS text messages to each device, utilizing the methods described in iMessage security overview. Replies are sent back to iPhone using the same method, and then iPhone sends the reply as a text message using the carrier’s SMS transmission mechanism. Text Message Forwarding can be turned on or off in Messages settings.