IPhone 4 Not working on iOS 7

Hi there. got updated my iPhone 4 today to iOS 7 from iOS 6.1.3. But now,after update, my phone is soooo slow.. incredibly slow, it lagg during the calls, and now the microphone is not working lol . is it iOS 7 or hardware problem?

I do not use tethering, so I could not answer that question. The best I can do is provide you with that support document which is for troubleshooting Personal Hotspot. To my knowledge, and remembering what I have read in other posts, I am of the understanding that you have to activate the hotspot first. I don't know that you pair the two devices until after hotspot is active. Here are the only two other support documents I'm aware of for Hotspot usage. Maybe they will help. This one is about understanding Hotspot http://support.apple.com/kb/HT4517 and this is about system requirements. http://support.apple.com/kb/ht3574

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