From Bulbapedia, the community-driven Pokémon encyclopedia.
Pokémon Mobile was a service that allowed fans to purchase Pokémon wallpapers and ringtones for their mobile phones. It was a co-operative effort between Pokémon USA and Ziggy, Inc. (one of the largest mobile wallpaper and ringtone distributors at the time). The service started in February 2006, and ran until 2008.
The wallpapers and ringtones could be purchased by texting the download code to 94649. The fee would then be charged to the mobile phone bill. The service was compatible with Cingular, T-Mobile, Nextel, Alltel, and Midwest Wireless.
Wallpapers cost $1.99 while ringtones cost $2.99 (excluding any additional carrier charges, taxes and surcharges).