Buy a hot spot, use it WiFi only, and use an always on VPN/Tor paid for in monero (make sure you can use it in your country). Or you can buy an alternative phone and only use that as a hot spot for the graphene phone. You could literally destroy or remove the camera, GPS, and microphone on the hotspot phone to make it exclusively a hot spot.
Buy a hot spot, use it WiFi only, and use an always on VPN/Tor paid for in monero (make sure you can use it in your country). Or you can buy an alternative phone and only use that as a hot spot for the graphene phone. You could literally destroy or remove the camera, GPS, and microphone on the hotspot phone to make it exclusively a hot spot.