The best alternatives to Truecaller are Hello, Callblock, and Bad Numbers. If these 3 options don't work for you, we've listed a few more alternatives below.
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Callblock is the first app that lets you stop telemarketing phone calls in iOS (https://techcrunch.com/2016/09/07/callblocks-new-ios-app-will-block-calls-from-over-2-million-telemarketers/), with the world’s biggest directory of telemarketers – now over 3,000,000 classified entries from over 100 countries!
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.
RoboStopper is a cross-platform app that blocks all unwanted phone calls, with an optional bypass rate that spammers must pay. No foolhardy blacklists, and more flexibility than iOS’s Silence Unknown Callers so that you don’t miss any important phone calls.