My husband and I can't connect when we are both in NEpal with our two iPhones. Bhutan is next and wonder how to find connection there also
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If your spouse's number is (123) 456-7890, put the number in your contacts list like this:
+1 123 456-7890
That will work in the US or anywhere you are travelling.
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Yes, when you are outside of the US and want to call a US number, you must use the country code. Exceptions would be countries which use area codes similar to US, such as Canada. Then, the 10 digit number should suffice.