Galaxy S4 user here. I'm not sure if this is necessary but I saw an option within contacts to copy my contacts to the sim card. I tried it once and it copied 230 contacts or so of 305. To resolve the issue I attempted to perform this again however I get the message "Sim card memory is full". I checked my storage and I still have plenty of space left on the sim. 1) Is copying contacts to memory recommended? 2) Are there any pros or cons to performing this action? 3) Has anyone else experienced this error before? Thanks!