At Apple, your trust means everything to us. That’s why we respect your privacy and protect it with strong encryption, plus strict policies that govern how all data is handled.

Security and privacy are fundamental to the design of all our hardware, software, and services, including iCloud and new services like Apple Pay. And we continue to make improvements. Two-step verification, which we encourage all our customers to use, in addition to protecting your Apple ID account information, now also protects all of the data you store and keep up to date with iCloud.

We believe in telling you up front exactly what’s going to happen to your personal information and asking for your permission before you share it with us. And if you change your mind later, we make it easy to stop sharing with us. Every Apple product is designed around those principles. When we do ask to use your data, it’s to provide you with a better user experience. Apple's Tim Cook On User Privacy [apple.com]

So unlike other companies’ messaging services, Apple doesn’t scan your communications, and we wouldn’t be able to comply with a wiretap order even if we wanted to.