Is this phone compatible with your carrier? I'd first check with this page first: http://www.apple.com/iphone/LTE/#iphone-6-iphone-6-plus.
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You might want to remove the SIM tray and reinsert it, as well as restart your phone if you haven't.
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You might want to remove the SIM tray and reinsert it, as well as restart your phone if you haven't. If you're still having issues, then you could try to restore your iPhone through iTunes on a computer.
Is this phone compatible with your carrier? I'd first check with this page first: http://www.apple.com/iphone/LTE/#iphone-6-iphone-6-plus.
You might want to remove the SIM tray and reinsert it, as well as restart your phone if you haven't.