2 Answers

Go to this page and scroll down to the videos and watch!!>>>https://www.google.ca/search?q=how+do+I+remove+the+Sim+card+and+Memoory+Card+from+the+Samsung+Galaxy+S+III&rlz=1C1AFAB_enCA479CA479&oq=how+do+I+remove+the+Sim+card+and+Memoory+Card+from+the+Samsung+Galaxy+S+III&aqs=chrome.0.57&sugexp=chrome,mod=0&sourceid=chrome&ie=UTF-8

You can follow the instructions in user manual or watch you tube videos to remove the sim card and memory card from your Samsung Galaxy S III. After remove the sim card if  you want to insert a new sim card in it and if it is a locked Iphone, it will not accept the sim. It will display invalid sim card or sim not valid. To fix this problem you need to unlock it from its current network lock. So that you can insert other network sim card in the phone. To unlock it get remote unlocking service from the site Mobileunlocksolutions.com and unlock it easily using the unlocking instructions given in the site itself. Have a good day.