www.chinaphonearena.com

I 've recently came back to Greece from a trip to Spain. When i try to speak with my phone (zopo zp 980) to another chinese brand phone, there is a noise in the line that made the communication very difficult. There is no problem when i speak with no chinese brand phones. Also there is no problem in 2G mode or in 3G when the phone charging. Does anybody haw an idea about that?

Sounds pretty strange,
Was this a consistent problem or could there have been something else to blame,
a weak signal on one of the phones for instance?

I also have a zp980 but never experienced any difficulties with calling to china branded phones or to big brand phones.

To be more specific with pulid s4 and s5 and Q9000 on the same network. I don't know if there is a problem with hd voice.