[bluedeer]

+1 is the US country code. If you recieve it, it may be because she's got her phone to dial 1 before dialling a number, and it's reporting that, or yours is, but that's typically what it is. This day and age when you dial a number like 800-888-8888, the system automatically makes you dial 1-800-888-8888, the +1 is 'this number belongs to this country.'. If you were to dial another country, like Germany, it would be +06 or whatever the country code is.