HT1222 my iPhone 4 hang/unresponsive after upgrading to new IOS 7

Hi All,
I am holding iPhone4 and my iPhone4 become slow or unresponse after upgrading to IOS7. For example, when I wanted to call someone, I click on contact and search a person name, the iPhone4 hang before I can type the complete name. I need to wait for several second for OS to time out. It is really problem for me. When I need to call a person urgently, I can successfully call after 1 to 2 mininute to wait for iPhone to response.
It become unusable for my day to day activities and it affect my woork.
I wanted to upgrade to new phone but it is out of stock most of the time. It has been happening to me for past two months.
How to overcome the issue of unresponsive of new IOS7 in my old iPhne4.
Someone told me to free up my memory to make it faster. I have 26GB free in my iPhone4 but it does not improve the suituation.
It hange or unresponsive all the time and it become unusable. It is not usable for life and death suituation.
Is there anyone can help me for this issue၊
thank you in advance.

Make sure you have the Latest Version of iTunes (v11.1.5) Installed on your computer
iTunes free download from www.itunes.com/download
Then... Restore as New (not backup) and Re-Sync your Content.
Restoring > http://support.apple.com/kb/HT1414
SYNCING with iTunes > http://support.apple.com/kb/HT1386

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HT1222 my iPhone 4 hang/unresponsive after upgrading to new IOS 7

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