I got the email from AMEX yesterday and was surprised at the 4x for the cell phone bills. My initial thought was that that would be the only spend I would continue to put on the card. Thankfully I saw the comments above and know that it is only for the BUSINESS card. (I only have the personal card.) I reread the email and it really was confusing and almost misleading if you didn't read the details and just skimmed the emails main points.
AMEX should NOT have sent this email out to personal cardholders!
After almost wearing the numbers off the card for years it now goes to the sock drawer to join the IHG Chase card there.