Cannot change microphone access in privacy options, iPhone 4S iOS 7.04

When trying to allow applications (viber, skype etc) to access the microphone in privacy settings, the apps either do not appear for me to allow them permission or the option is totally grayed out so I cannot allow permission....! Help! Any ideas as to why and how I can remedy this? It's really frustrating. I've uninstalled and reinstalled all apps and still no results.

My iPad is on iOS 7.04 and has no issues with this so I can only imagine it is the phone causing this problem?

Any help will be greatly appreciated. Thanks!