How can I quickly verify my phone number when registering on a freelance marketplace?

To quickly find some weekend freelance work, I decided to sign up on a local freelance job board. The site required profile verification via mobile number confirmation. I used a virtual number from https://onlinesim.io/ and entered the code I received into the activation field. My profile was successfully verified on the first attempt, allowing me to immediately respond to a couple of lucrative offers from clients.