Does each smartphone have an unique IP address?

[neku]

Usually each smartphone has a unique IP address. However in the last few days I am getting an error message that the phone ip address is being used elsewhere. Has anyone else faced this problem with their phones?

 

[Cpvr]

It’s possible that your ip address is being shared by someone near by. Especially if you’re connected to your regular cell service tower.

 

[neku]

How many people are usually sharing the same smartphone ip address? Is it possible to find out the phone number sharing the ip address using any online tool?