Well, a local agency got busted.
Stop and think about what this means. Big brother can read all his text messages for the past X months. Then they can read the text messages of all of his customers. Then follow the trail of who that customer texted with.
Texts are considerably worse than voice calls because all texts are recorded and kept for a long time. They can go back and see the texts from before an investigation starts and court orders are issued.
Voice call audio is not routinely recorded unless an investigation is already in process and a wiretap order has been issued by a judge. Even then, voice call monitoring is a lot more work than text monitoring. Voice call numbers are usually recorded and kept.
Don't assume that something like Google Voice will protect you either. If they get a warrant, Google will give you up in a heartbeat. Google may be good about fighting illegal warrantless data requests or overly broad warrants, but they will comply with legal warrants.
Don't get too cocky about having a hobby phone, either. Location is recorded by many cell phone systems. You can also find out a lot by reading your call records and texts, especially if you use the phone for non-hobby purposes.
So, when you're happily texting your clients or a provider, just realize that Big Brother is looking over your shoulder and writing everything down.
Yes, text may be convenient, but they're a lot more risky.
You may slip through the net if you're a little fish, but you're definitely in the net.