HT1976 iPhone 5 has suddenly stopped connecting to the internet away from home

My iPhone 5 has suddenly stopped connecting to the internet when away from home. It was fine last Wednesday, then on Thursday all I got was 'Safari is no longer connected to the internet'. I cannot use the Messaging, Find my Friends etc.
As far as I know I have not done anything to alter any settings, but I did change my password on Wednesday - which works, so I think that's OK.
Has anyone any idea what is happening?
ictoau

Hello, ictoau. 
Thank you for the question.  You may find this article helpful in troubleshooting the carrier data connection issue you are experiencing. 
iPhone: Troubleshooting a cellular data connection
http://support.apple.com/kb/ts3780
Cheers,
Jason H. 

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