Usages of colgar
Él acababa de marcar cuando decidiste colgar.
He had just dialed when you decided to hang up.
Acababa de contestar, pero tuve que colgar por el wifi pésimo.
I had just answered, but I had to hang up because of the awful Wi-Fi.
Cuelgan la llamada cuando falla el internet.
They hang up the call when the internet fails.
Elon.io is an online learning platform
We have an entire course teaching Spanish (Latin America) grammar and vocabulary.