I have a Verizon iPhone 5. I'm going to be visiting family in Asia for a month and will be switching to a local SIM card. Will I no longer be able to use iMessage with my US number during this time? If so, is there any way to get around this? I would at least like to keep using iMessage (with my US phone number) on my computer. So, basically, my question is whether or not my US number will immediately unlink from my account as soon as I insert a new SIM.