Who called from 4156514423

I received a phone call from this number and it said it was from a  (Brandon Thomas )???
Who is that ? & what is he calling me 4 ???

I received two text from this number +1 (415) 651-4423

Says the caller was Ann.

The two messages were:

Ann  sent you a GIF: http://relay.im/i/MASYWQ

They're not anything harmful, just a link to an app to download via App Store

Relay is an app you probably added to your smartphone. I just added it yesterday and registered, got the text from 415-651-4423 asking me to "send this text to verify your phone number"

It says Johnny sent you a video