What are these text notifications on iphone?

Basically I'm getting these pop ups on my iphone 5, and I have no idea how they are being sent or who they are being sent. I'm being sent some absolutely vile messages and they are really uncomfortable, how can i trace the number or find out who's sending them?

They appear like in the photo i have provided.

Seems to look like an app that's sending those. I would delete any recent apps you have downloaded and check if that's the source

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