data loss

Hi!

My iPhone, when connected on Wifi network, works just fine, but when I turn wifi off and the Cellular Data is on, the network do not works. Do not appears 3G or 4G icon. Is like the Cellular Data is off.

After reboot, 3G or 4G appears and the netowrk works again.

I have the same problem with iPhone 5, 5S and 6 and doens't matter what carrier is connected. With Android devices, never had this issue.

I tried to update the iOS, reset network settings and restore iPhone, but nethier of those works.

Anyone can help me?

Tks.