What solution is available for smartphone with Android? I would like to setup unused phone with Android system and SSH server (there are apps) to make it a standalone server connected with internet only via LTE/GSM (using simcard). I learnt that it is impossible to connect to a device using LTE connection. It's "public" IP is not so public, LTE providers have a lot of infrastructure configurations (NAT?) to not allow incoming connections initiated outside the phone. What is the best solution here? What are free for fair use (just ssh, maybe a httpd with lightweight script page), what are paid solutions. Thanks!