Unlocked iPhone 4s purchased from Apple two years ago (out of warranty) running IOS 7.0.6 (11B651) I raised this with Koodo and I have now had two calls with them and tried several fixes without success. I suspect that is the end of Koodo support as they probably suspect the problem is with my phone? For over a month now, while on any WIFI network I can use Safari, get mail, and use all my other apps (e.g., Weather, Stocks, etc.) without a problem. But if I switch WIFI off (but I still see “Koodo 3G” on screen) and then try Safari, or other apps I get the message "Could not activate cellular data network. You are not subscribed to a cellular data service" But I do have a data plan with Koodo and it was working up to a month ago and Koodo tech support says I have an active plan. My wife, who is on the same account and also has an iPhone 4S, does not have any problem. I have tried a “reset Network settings” without success. In “settings > Cellular” Cellular Data and Enable 3G are both “on”. In “settings > Cellular” “Use cellular data for:” Safari, Stocks, Weather, and many other apps are “On” In a response to an earlier post of this problem Dennis suggested I check self serve to ensure I don't have data block on? I went to self serve but was not sure where to look but after checking everything I could see I saw nothing that looked like my phone was being blocked. Is it likely my phone is failing and I will need to get it repaired? Or are there any other suggestions?