I'm not sure, I doubt it, but that doesn't mean there aren't other ways to intercept them.
iOS still sends normal text messages to any device that isn't iOS. I use an Android device for the most part and almost everyone I know uses iOS, which means that even if I'm using TextSecure the message will be delivered as a normal text message, which certainly can be intercepted and stored by Stingray and similar devices.
iOS still sends normal text messages to any device that isn't iOS. I use an Android device for the most part and almost everyone I know uses iOS, which means that even if I'm using TextSecure the message will be delivered as a normal text message, which certainly can be intercepted and stored by Stingray and similar devices.