I don't really get why this is such a big problem. When you wipe your own phone does all your email, texts and call records go poof? The email sits on servers that are periodically backed up. Large government mail systems have farms of load balanced email servers. Destroying one or two servers or wiping it's harddrives is irrelevant. The systems are designed to have multiple servers fail and continue to function serving email. Call records and texts are logged and stored by the phone carrier. The only data you may lose is if the data was stored locally on the phone like a document. You don't need the physical phone to reconstruct the data that passed though it. Unless of course you have a team of government IT and phone carrier people in the background actively scrubbing data and destroying backup media. That's a lot of coordination between a lot of people expected to keep quiet.