I've got a little business with around 1000 customers and I like to take advantage of a mobile plan that lets me send a lot of SMS messages per month.
I've got my customers' emails and phone numbers on a spreadsheet. I'd like to export that phone list to the iPhone and create a "customers" group on my address book, and from there be able to send this group offers and news through SMS from my phone.
Is there some iOS app that would let me this, or maybe another parallel solution that combines my desktop PC on my iPhone to perform this task?