log says:

Oct 2 19:35:39 eshant-Inspiron-N5110 NetworkManager[1101]: <info> WWAN now 
enabled by management service
Oct 2 19:36:24 eshant-Inspiron-N5110 kernel: [18054.986799] 
[drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle 
[waiting on 5245410, at 5245410], missed IRQ?
Oct 2 19:36:39 eshant-Inspiron-N5110 NetworkManager[1101]: <warn> CDMA 
connection failed: (32) No service
Oct 2 19:36:39 eshant-Inspiron-N5110 NetworkManager[1101]: <info> (ttyACM0): 
device state change: 4 -> 9 (reason 0)
Oct 2 19:36:39 eshant-Inspiron-N5110 NetworkManager[1101]: <info> Marking 
connection 'BSNL EVDO connection' invalid.
Oct 2 19:36:39 eshant-Inspiron-N5110 NetworkManager[1101]: <warn> Activation 
(ttyACM0) failed.

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https://bugs.launchpad.net/bugs/864658

Title:
  BSNL(India) EVDO Card (cdma 2000) usb wireless modem not connecting

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