To travel on your mobile phone, you can say "I'm using my mobile phone to travel" or "I'm using my phone to plan and book my travels." If you're using a travel app or website to book fpghts, hotels, or activities, you can also say "I'm using a travel app on my phone" or "I'm booking my travels onpne using my phone." If you're using your phone to navigate or get information about your destination, you can say "I'm using my phone as a GPS to navigate" or "I'm using my phone to get information about my travels."