Until this become feasible for everyday use, there's a company called Silent Pocket making Faraday cage cell phone sleeves. I have one, and use it every day, except for at work and home. It blocks cellular, GPS, wifi, gps, and bluetooth. I've tested it many times using 3 different cellular carriers and 8 different wifi spots with no issue to date.
https://silent-pocket.com in case you're interested.