I had the dilemma of choosing s4 and HTC one. I was a previous Samsung galaxy 2, note and nexus 4 user. End up choosing HTC one mainly because :-

1) unibody aluminium body compared to cheap plastic. Next to S4 the HTC look like a million dollars while the s4 looks like a bargain basement phone. I can say it has a better built compared to even the iPhone 5. This is how a proper iPhone should look like if it had a bigger screen. Actually I even prefer the Nexus 4 looks compared to S4. If only it had a higher resolution screen it could even whoop the s4.

2) good camera for all situations with image stabilizer, especially low light.

3) superior stereo speakers which correctly faces
front. We are now in 2013 so I can't imagine why phone still uses mono speakers.

4) although on paper s4 is faster, in reality HTC one is smoother. S4 is quite jerky when scrolling between screens while testing it at the digi store.

This post has been edited by DannyOP: May 19 2013, 12:29 AM

If u mean block calls yes under contacts you can choose to block user.

This post has been edited by DannyOP: May 21 2013, 11:33 PM