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I have a Reliance netconnect+ zte Ac2737. It has an allocated data of 5gb per month. The modem works fine only after the allocated data is over, for which i have to pay extra to the provider. I tried contacting the provider, but it was not of much help. The system detects the modem every time. I assume that it must be a possible problem with the provider, so is there any chance it is the problem of Ubuntu 12.04 LTS 64 bit itself as i have no other reason to think otherwise an it works fine every time on windows.

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are you using correct dialup number with modem? Try installing this software And it will monitor data usage – BigSack Sep 26 '12 at 12:03

Ubuntu has no knowledge of how much data balance you have left, so the problem is indeed with your provider.

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Check these settings with your service provider like Reliance Card is CDMA or GSM. If CDMA Card, number is different. You many need to enter your username and password too.

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