How can I access from my mobile phone to my XAMPP?

You need ngrok

Run at console/Terminal

ngrok http 80

You will get something like :

ngrok by @inconshreveable

Tunnel Status                 online
Version                       2.0/2.0
Web Interface                 http://127.0.0.1:4040
Forwarding                    http://92832de0.ngrok.io -> localhost:80
Forwarding                    https://92832de0.ngrok.io -> localhost:80

Connnections                  ttl     opn     rt1     rt5     p50     p90
                              0       0       0.00    0.00    0.00    0.00

At the cell phone, open at browser the link like this that appears at the console