Write a php files to detect visitors' phone number when they use smartphone to visit my website via 3g/4g

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Hi there - My name is Anton. I’ve read your brief and can see that you’d like to build. I'm has 7 years experience designing and developing. I would approach your project by starting with wireframes and getting the design completed, before starting the actual development phase. I am highly qualified for this project and would love to speak with you further about taking this project on. Thank you for attention. I am waiting for your answer in the chat.