The best alternatives to TrueCalling are Remote Internships, Any Intern, and Intern Supply. If these 3 options don't work for you, we've listed a few more alternatives below.
Intern Supply hosts applications for paid summer internships in the United States that are hiring undergraduate Computer Science/Software Engineering students.
Truecaller's iPhone app has been completely re-written from the ground up to be lighter, more efficient, but most important of all, 10 times better spam, scam and business call identification compared to previous versions of the app.
Umpyre is a messaging app that helps you get paid for your attention. Sign up, create a badge, post it to your social media profiles so people can contact you. Inbound messages are ranked by their value, so your inbox becomes an auction. Pure value, no spam.