Ican´t see my website on his cell phone.

Are you using Sitebuilder plus or Websitebuilder? SB+ website are not mobile compatible. You need to secure your websites using the instructions below for your respective operating program.

WHY HOMESTEAD'S NEW WEBSITEBUILDER PROGRAM?
You need to have a website program that is mobile friendly. That's why the old homestead sitebuilder desktop and sitebuilder plus architecture won't work. All website hosting companies have had to upgrade their programs to accommodate the new mobile demands. Like window 7 is made obsolete by windows 10. Homestead's new Websitebuilder is their solution to mobile friendly website design. We need to be flexible is these rapidly changing times. Change or be left behind.
For WebsiteBuilder sites look at these instructions.
https://community.homestead.com/homestead/topics/websitebuilder-password-protected-pages
NEW WEBSITEBUILDER:
You can upgrade to the new WebsiteBuilder! You can rebuild your site in the background while your old one is still up and running. After you're done, Homestead can switch your domain over. This new builder has a mobile editor built in.
Helpful Youtube tutorial videos on this builder, if you would like to watch those: https://www.youtube.com/user/homesteadwebsites/videos

WEBSITEBUILDER TEXT EDITOR FOR MOBILE ETC.:
Hello, please take a look at this article about editing text with your
https://community.homestead.com/conversations/websitebuilder/websitebuilder-text-formatting/5f2a9b2058180958845beecf

Secure My Homestead SB+ Website With HTTPS?
https://community.homestead.com/conversations/sitebuilder-plus/can-i-secure-my-homestead-website-with-https/5f2a9b1658180958845a60de
If you're having trouble with the Cloudflare set up, you can always call for assistance 1-800-710-1998

Secure my Websitebuilder website with HTTPS:
https://community.homestead.com/conversations/websitebuilder/websitebuilder-ssl/5f2a9b3158180958845dab29
If you're having trouble with the Cloudflare setup, you can always call for assistance at 1-800-710-1998.

HELP?
Hours of Operation for Live Support: Mon-Fri: 6:00am - 5:00pm MST (No DST)
Sales: 1-800-986-0958 (Support can also be contacted via this number)
Support: 1-800-710-1998
FREE SEO Consultation: 1-888-412-9962
Sat-Sun: Closed

Hello, 

Your website is working on mobile on my end. 

Only one domain can be connected to a WebsiteBuilder site directly. Please follow these instructions to point your other domain:

‎WebsiteBuilder: Connect More Than 1 Domain to Site | Homestead Community