Update, 4th September:
Please refer to the attahved 2nd image (infi PA11.png). I have on my own tried to do something earlier, which I am not completely satified, and feel this can be and shold be improved. Originally did not want to attach this image, in order not to influrnce you, the designers too much, and allow you to come up with the "original sparkle". But now I could not resist sharing it. Please forgive me! And more importantly, do that original sparke, and don't get being influenced.
Please refer to the attached image (logo unld PA1.jpg). The idea is to have an "infinite sign" (Verdana Bold Font) created from dots, simiar to the shape beneath the sign. This also needs to be combined with the text (UNLIMITEDCALLS.COM).
Target auduence is early adpters of iPhone, Google Android mobile phones. Age: not relevant, but potentially younger generation. Gender: both. Location: global. Education: not relevant.
Interests: "gadget fans" alrady using mobile, mobile applications, mobile internets, mobile broadband. values: unlimted data access, unlimited text messages, unlimited voice calls. Prepaid. But not excluding business segment.
No need for slogan (the brand name is the sogan already)