IPhone 5 LTE not showing up after calls?

My iphone 5 gets LTE after I reset network settings, but everytime i answer a call LTE goes away and i have to reset network settings AGAIN if i want LTE back. >< Help

LTE is a brand new technology and Apple announced for people to experience issues while they are working on the newest technology. Also I would make a Genius Appointment if it does it when surfing the INTERNET. Apple will fix the phone!

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