We got our His and Her iPhone 5c (pink and blue, of course), restored them both from out backed up old iPhones and learned a couple of thing:
-Neither had "LTE" on the top of the screen...which we never noticed until we did the following rest.
-One could send/receive pictures and videos via text message but one could not.
-One let a new voicemail account be set up but the other said it had network issues.
Easy Fix: Go to --> Settings --> General
Scroll all the way to bottom and select --> Reset
Select --> Reset All Settings
It'll make you confirm it and then reset it all and reboot your phone.
For us, this fixed all the above problems but did erase our tweaks we had done (like wallpaper, etc.)
We love these phones....so much fun learning the new features!