Some people are concerned about privacy issues from mobile apps, instead of installing mobile apps, you can actually search spam and suspicious phone numbers directly from free websites. We listed some of the examples below, you can search phone numbers from any country for free.
1.Whoscall (no login required)
2.Showcaller (No login required)
3.Truecaller (login required)
4.Sync.ME (Need login if you want detailed information)