i dunno, I mean sure they may pay your sell phone bill, but also they may overload you with spam
a check on the privacy page yields this info
In order to offer you the best possible experience using the Service, we collect the following information:
Information you provide. When you use the Service, we may ask you for personal information, such as your name, mobile phone number, email address, zip code, age, and gender. You may also have the opportunity to provide the email addresses or mobile phone numbers of friends or family members to tell them about the Service. We may combine the information we collect from you with information about you that we receive from other online and offline sources, such as from our merchant Partners, in order to provide you with a better experience and to improve the quality of the Service. For certain services, we may give you the opportunity to opt out of our combining such information.
Mobile device identification information. When you connect to the Service through your mobile device, if your service provider uniquely identifies the device, Yada Yada will receive this information. Yada Yada may use your unique mobile device identification information to offer you extended services and/or functionality. Certain Yada Yada services may require our collection from you of the phone number for your device. We may associate that phone number to the mobile device identification information and to other information we have collected from and about you; however we will not use that number for telemarketing.
Usage information. As part of the standard operation of the Service, we may collect certain non-personal information from you. This may include the dates and times you used the Service, your phone's manufacturer and model and your response to messages the Service sends. We may combine this non-personal information with your personal information.
Direct communications with Yada Yada. When you send email or other communications to Yada Yada, we may retain those communications in order to process your inquiries, respond to your requests and improve our services.
Information you provide on our Partners' websites. We offer some of our services in connection with the websites run by our merchant Partners. Personal information that you provide to those sites may be sent to Yada Yada, and we will use it in accordance with this Policy. Our Partners' sites may have privacy practices that are different from Yada Yada's (and which we do not control), and we encourage you to read their privacy policies.
---I've outline questionable things in red....
Thanks for the info, however i won't be signing up