My phone is activated and has monthly top ups. I activated it a few weeks ago and it worked fine for texting and calling. I did not used it for two and 1/2 weeks. Now it will not text or call and says 'no service' where the provider should be. In settings it tells me my carrier is Koodo but I am not on a network. I have an iphone4. I have the plan where I can make calls and text but I have no data. My account looks fine when I login. I have lots of minutes left and unlimited texting. I tried taking out my sim card and powering down. Why will my phone not work?