This simple and portable signal jammers for GSM GPS looks like a Power bank and can be carried daily, because it is only 100 grams, which may be lighter than your iPhone. And you only need to turn on the POWER SWITCH on the right side, it will block PCS/CDMA/GPS/Glonass signal at the same time within 10 meters.

https://www.thejammerblocker.com/universal-portable-signal-jammer-for-gsm-gps-sale-online/