I wonder ...

.
... are there any encryption apps for text messages?

The portable device, which is the size of a suitcase, pretends to be a legitimate cell phone tower that emits a signal to dupe thousands of mobile phones in a targeted area. Authorities can then intercept SMS messages, phone calls and phone data, such as unique IMSI and IMEI identity codes that allow authorities to track phone users’ movements in real-time, without having to request location data from a mobile phone carrier.

I know that there are a few computer-based PGP apps for the phone, but I wonder if anyone will develop a PGP app for text messages.

Not that I have anything to hide, but it seems it would piss of the right people.

pm