The speaker is near the FaceTime camera on the front of the phone
That's actually one of the complaints by some people: the stereo sound will be uneven as some of it is coming out the front of the phone and some is coming out the bottom.
I don't think there's a grill, speaker at the top. It just under the top, probably by the phones earpiece. I could be wrong, that's just what in assuming. And to me that's a very bootleg/shady stereo.
The speaker is built into the earpiece on the front of the phone. Could be a good thing as the sound will be directed towards you instead of to the side.