IPhone 4s dropping(cannot make) calls.NOT blacklisted.What do I do?

As outlined above.,I recently purchased an iphone 4s 16GB on vodafone ie from a friend.Whenever I try to make a call or text the iphone cuts it off.I was told by vodafone that it is definietly not blacklisted.Vodafone support also told me simply topping up my phone would solve the problem,which i tried but couldnt even make the top up call.I did manage to make a call earlier today after purchasing a new sim but now the problem persists.Any help would be greatly appreciated.

Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new). Has any of this been tried?
Have you tried re-inserting the SIM or replacing the SIM?

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Since this is a first generation iPhone, is your iPhone hacked to be unlocked for use with another provider than was intended for this iPhone?

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Hello MJFan227,
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It could be the work of one of your add-ons, or even add / mal-ware.
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'''Windows:''' Start > Control Panel > Uninstall Programs.
'''Mac:''' Open the "Applications" folder.
'''Linux:''' Check your user manual.
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'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware Troubleshoot Firefox Issues Caused By Malware]''' {web link}

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First question where ae you located? If you're in the Middle East or UAE, factime has been restricted by the government.
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http://support.apple.com/kb/TS3367

IPhone 4s dropping(cannot make) calls.NOT blacklisted.What do I do?

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