bill - 2:46 am on Jan 28, 2008 (gmt 0)
We've had location based mobile ads in Japan for about 8-9 years now. It's an opt-in service and all data packets received are free (advertisers pay the carriers). Most phones have separate ring-tone settings for these ads so you can tell them apart from regular mail or calls. I hardly even notice them, but it's nice to check occasionally for local coupons.