Website monitors check your sites and alert you when your site is in trouble. I use five monitors. They check my websites at a regular intervals. If my site is down / or back again, they will send me email. I use my phone to receive those emails. So I will know how my sites' statuses, no matter where I go. Here are five of the monitors that offer free monitoring service I am using (some of the links are affiliate links, I hope you do not mind):
Site24x7
http://www.site24x7.com/ Website Monitoring from a global perspective
With a free account, Site24x7 can monitor 2 websites and check your websites in every 60 min.Read more >>