Yes it is only in deep web you can find hackers that are willing to work for $$$ . I have used hacking services on phone hack twice and deep web was where I found both hackers. Dark Basin Forum or CryptBB forum is mostly where I use but I prefer Dark Basin because their hacker are screened manually before they are allowed to work on that platform. My fav hacker group is Barrysanchez with phone hack because they had more reviews on phone hack. You can try one of those forums or you can add "Athackermaildotcom" to Barrysanchez and you should be able to know if your faith with their services and pricing.
FYI always make sure you hire a hacker anonymously just to be on the safe side.