Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
Responsive Website Test - Test any website on desktop, mobile, and tablet
TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
Responsive Viewer - View multiple screen dimensions in one view
Burner - Disposable phone numbers -- now with MMS photo support
LT Browser by Lambdatest - LT Browser is a free dev friendly browser for developers and testers. You can see mobile view of website on different screen sizes and resolution on 50+ pre installed view ports. You can build, test and debug your website faster then ever.