BV2000s No internet with any SIM

[alexit]

Hello,
With 3 different italian operator: 3, Vodafone or Wind I don't have any internet service, phone calls work. WiFi works good.
SIMs are working good with Samsung. I've checked the frequency and all of three are compatible with the phone.
I verified all the parameters (APN, MCC, MNC ans so on) and I always get web page not available.

phone info:
Model BV2000s
ndroid version 5.1
baseband version: S2609_G4_W1258_A_MP_V0.5.5_S151211, 2015-12-11 16:11
kernel version 3.10.72 jenkins@80-12 #1
build number BV2000s_B2_Blackview_V1.0_20160523

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