1:1 calls
The following system requirements must be met by both the caller’s and the callee’s device:
Android
Voice calls: Threema 4.8 for Android or above on Android 5.0 or above
Video calls: Threema 4.8 for Android or above on Android 5.0 or above
To receive calls when Threema is in the background, Google Play Services are required
iOS
iPhone: Threema 3.0 for iOS or above (voice calls) or Threema 4.6 for iOS or above (video calls) on an iPhone 5s or above running on iOS 10 or above
iPad: Threema 3.0 for iOS or above (voice calls) or Threema 4.6 for iOS or above (video calls) on an iPad Pro, an iPad Air, a 5th-generation iPad or above, or a 2nd-generation iPad Mini 2 or above running on iOS 10 or above
iPod touch: Threema 3.0 for iOS or above (voice calls) or Threema 4.6 for iOS or above (video calls) on a 6th-generation iPod touch or later running on iOS 10 or above
Group calls require Threema 5.0 for Android or above or Threema 5.6 for iOS or above.
