Hissing sound?

[Str8_Krazy]

I hear a hissing noise in the background when using the handset to answer or make calls. Anyone else experience this?

 

[quentinfisher]

What kind of signal are you getting? Is it occuring in anything else that requires sound, videos, music, etc? Have you updated your PRL(could be the source of poor signal)?

 

[aerajan]

I hear a hissing noise in the background when using the handset to answer or make calls. Anyone else experience this?

Yes, I experienced a similar issue on my 1st Hero (now on my 2nd and it's fine).
I had encountered static/fuzziness in the earpiece and exchanged my Hero for another one. It was clearly a hardware issue and there was nothing they could do to fix it so I got another one.

My advice to you is to swap it at a Sprint store asap before your 30 days are up.