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No network coverage on my Micromax Canvas 4
I am using Micromax Canvas 4 ( Android 4.2.1 ) . I have installed some pirated games on my device and right after 1 week all the signal bars goes down. Now there is no signal on my device from last month. Sometimes they come after 7-10 days and went away the same day.
I have tried these following steps :
1. Rebooting several times.
2. Factory Reset.
3. Changing SIM Card.
4. Changing automatic network selection settings to manual and then to automatic.
Please help me.
P.S. : Whenever I change my SIM card it says " Your phone date is inaccurate". < - - May be this is the reason.