How do I fix my Samsung S4 that keeps prompting me to restart since it doesn't recognize the SIM Card?

Jeffrey from San Diego, CA

Episode 1421 (31:41)

https://commons.wikimedia.org/wiki/File:Samsung_Galaxy_S4.svg

Jeffrey has a Samsung S4 that doesn't recognize the SIM card frequently, and asks him to constantly restart. Leo thinks he likely has a loose SIM card and recommends re-inserting it. SIM cards can also get damaged, though Jeffrey should at least have the option to take it to the T-mobile store and ask for a fix.