I have a column for phone numbers that come in from the form and they come in with the +1 format. in the column right next to it I'm trying to write a formula so that if the phone is blank it gives N/A.

=IF([Mobile Phone]@row > 0, "[Mobile Phone]@row", "N/A")

I know my problem is the + sign because if I remove it the formula works fine however I need to process to be automated and I don't want to have to come in and remove every single + sign when the form automatically puts it there. Any help? Thanks