The auto-renewing subscription can be monthly or yearly and the price depends on the option you chose. It’s a free download on the App Store and comes with ads and in-app purchases. You can even choose to block calls and texts from numbers using nothing but Truecaller, making this a truly powerful app to have on your iPhone. In addition to offering reverse lookup, Truecaller can also put a stop to spam, fraud and Robocalls by prompting you well in advance of your call, allowing you to take necessary steps accordingly. Truecaller has a large database of users (both registered and unregistered), which lets you get info on that missed call or the unknown number that you keep getting calls from. This is without a doubt one of the most popular reverse lookup apps out there and without a doubt one of the most effective as well. Best Reverse Phone Lookup Apps for iPhone 1. With that in mind, let’s take a look at our list. Bear in mind that while most of these apps are free to download, you may need to make an in-app purchase to access additional features. We’ll discuss five of the best reverse lookup apps for the iPhone. If you have no idea which apps to pick, this list we’ve compiled for you is surely going to help. However, there are multiple apps available today on the iTunes App Store that can help you perform a reverse lookup to ascertain who called you, and in some cases, even get information on names as well as other data about the individual. We’ve all had situations where we get calls from unknown numbers and there’s no way to trace it back to the source.