Hey,
I am 99% sure the only problem you are facing is because
port forwarding has not been setup properly.
Follow this guide carefully:
http://qrcctv.co.uk/cctv/cctv-port-forwarding
Then check your IP address and make sure it has not changed:
Here is a addvert free IP checker tool:
http://qrcctv.co.uk/myip
Which port are you using for mobile?