[Q] MTK6575 (ZP100) Data connection issue - Android Q&A, Help & Troubleshooting

I have zopo zp100 (MTK6575) and i've installed android 4.0.3
On some Operators Data Connection doesn't work at all.
APN settings correct.
In status bar connection shows as active. But no data transfers.
ping has no responce.
On another operator all works fine.
On android 2.3.6 data connection works for both operators.
How can i investigate this problem?

Settings>More>Mobile networks>Access Point Names>"Your provider">Authentication type>None

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