I haven't noticed anybody mention this so I'd like to bring it up.
Google WILL turn over your google voice info to LE:
source:
https://www.google.com/transparencyr.../legalprocess/
Subpoena:
Subscriber registration information
Sign-up IP address and associated time stamp
Telephone connection records
Billing information
Court Order:
Forwarding number
Information obtainable with a subpoena
Search Warrant:
Stored text message content
Stored voicemail content
Information obtainable with a subpoena or court order
So, it seems google voice protects me from the provider knowing my real number, but doesn't protect me from LE. If a provider gets busted, and LE goes thru her phone and discover previous conversations with me, should I worry about them investigating further via any of the 3 methods above?
I could get a burner phone, but it would be difficult to hide from my SO. I could hide a burner SIM card a lot easier, and swap it out with my main SIM card as needed, but then LE could still tie the 2 SIM cards together with the IMEI number. Am I being too paranoid?