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I think you should either contact the company that you bought the camera from or the manufacturer of them and ask them how to connect and view it from your phone. They will probably have more knowledge of this than this forum.
You should read your product user guide to learn howto setup your product for remote viewing as this a forum for BT products only.
The user guide for your product states that:
BT residential do not offer a static IP address. You will either do as the product guide suggests or move onto BT business line.