computer gurus in the house please i need ur help.

I have a mobile phone, windows phone to be exact,one day i decided to check my ip address on the web.
i was shocked at the report of fraudulent activities that was associated with the ip address of my mobile phone.
I saw a lot of reports by so many people reporting my ip address as fraud.

i did not take that of my mobile phone seriously until recently when i bought a new laptop(brand new), i checked the ip address on the the web only to discover that my ip address is registered with a company in lagos while am based in Abuja.

i want to know if i should be worried about this?
is this normal?
can someone else make use of my ip address?
can two computers share the same ip address?

thanks in advance