I just bought a 7-11 Wireless speak out, and reading the User Guide has confused me. Who is my Service Provider and why do I need one? I only want a pay as you go phone, purchased $100 airtime, tried to activate and it keeps telling me the "back end" is down or out of order, and the SIM card was rejected – what do I do next? Do I need a service provider? I could really use some in-depth discussion as I am totally blind here. Thanks Peter.