Calls on Slack - Make voice calls in Slack

quackr - Protect your privacy & identity with quackr. Use our free temporary phone numbers to receive SMS online now.

Rebel Calling - Internet-free international calling for $1 a month

Textverified - Textverified is a website that is designed as a phone verification service, allowing the user to bypass the phone verifications and receive codes through social media websites and applications.

Skype for Slack - Move your slack discussions to a group skype call

Mobilesms.io - Mobilesms.io is a website that allows temporary mobile phone numbers to sign up on any application or website without giving your personal number.