I have just purchased a new 4g 32gb dual sim and I have noticed that when the wifi is on my mobile signal drops and when I check the sim card it says it is disconnected. Is this supposed to do this? It seems I can still recieve calls but when my wifi goes off my data deosn't seem to take over. I am confused on this if any one could shed some light I would be most grateful. I have tried the sim in both ports and it does the same in each.