Is there an app that blocks spam with spam words?

pu1. It won't be possible unless Apple makes it for us

2017-10-30

OK

pu2. The iPhone is not supposed to give the app access to text messages, so you can'tIt's that

2017-10-30

OK

pu3. If you use KT, there's an app that KT provides that blocks spam
It seems like the carrier is blocking it before you get it

2017-10-30

OK