New phone issues

[Toots1985]

Hi I've just recently upgraded my phone to the iPhone 6 and my loudspeaker button doesn't seem to work, if I press it I can hear the person on the other end but they can't hear me.. 

[BandOfBrothers]

Hi

Is there any form of screen shield applied or a case. 

Try looking a the mic for any foreign debris. 

Also 

On the iPhone hold down the Sleep/Wake Button and Home button together until the Apple Logo shows. Then On seeing this Apple Logo release both buttons ,and the iPhone will reset , which has been known to clear most glitches.

If you have a local Apple Store pop in and a member of the Genius Bar will take a look or if they are busy arrange to text you to return. 

or make an appointment via https://www.apple.com/uk/retail/geniusbar/ 

[kids]

Try a hard reset.

Hold the home and on/off buttons down until the Apple logo appears then let the phone restart itself.

If that does not resolve the problem your best course of action is if convenient to call into an apple store and let a genius take a look.

Alternatively you can send it for an inspection through a Vodafone shop but apple is going to be the fastest and most reliable method.