All icons have been obtained from https://thenounproject.com/
and are all licensed under CC BY 3.0
 

The attributions are the following:

crowd of people by Musmellow from the Noun Project
Phone by Juan Pablo Bravo from the Noun Project
crowd of people by Musmellow from the Noun Project
Laptop by B. Agustín Amenábar Larraín from the Noun Project
Smartphone by George Agpoon from the Noun Project
share file by Vectors Point from the Noun Project
cost by Hopkins from the Noun Project
Infinity by Cengiz SARI from the Noun Project
compatibility by Anton from the Noun Project
hand cursor by Majo Puterka from the Noun Project
time is money by icon 54 from the Noun Project
Smart Watch by Yigit Pinarbasi from the Noun Project
Mixing Desk by Random Panda, GB from the Noun Project
Sound by IconfactoryTeam from the Noun Project
Phone by Tom Walsh from the Noun Project
Communication by Kmg Design from the Noun Project