4G No Wifi portable Cameras for security in hotels etc

HelloI am concerned about security when I travel (eg in Hotel rooms) and think it would be a great thing to have a battery powered portable SD storage camera that used 3G/4G to combine SD storage and internet access via a SIM data plan. With the Ring brand being so successful in the home market, I feel sure there are others like me who would find such a model appealing. It could also be used as a security system for elderly people who do not have an internet/wifi connection and whose safety can be securely monitored by themselves and relatives.What do you think