I have a Samsung Galaxy Exhilarate. I have accumulated a lot of memos through the Memo app that came with the phone. I am going to Canada and plan to replace my SIM card with a Canadian SIM card and temporarily buy service from a Canadian provider. Will I continue to have access to the data I've accumulated though the Memo app?
SIM card and application data are not related at all. You can change SIM and the only thing you will lose is contacts and messages stored in the SIM card – if you have them stored on SIM. See this for help Backup SIM message and contact without transfer to phone