Although investment in mobile marketing strategies like advergaming is slightly more expensive than what is intended for a mobile app, a good strategy can make the brand derive a substantial revenue. Games that use advergaming make the users remember better the brand involved. This memorization increases virality of the content so that the users tend to recommend them to their friends and acquaintances, and share them via social networks.
Once you've collected your mobile numbers, verified that you have followed all of your legal responsibilities you can start your SMS marketing campaign. I'd suggest using a 3rd party service provider to ensure that you are able to track the return on investment for your campaign, embed an unsubscribe message, and easily manage your SMS marketing database including unsubscribes.