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Its very simple just press *#7370#. Then it requests for the security key whic is 12345 by default or enter your security code if you have changed the security code.. Please note that all the data on your phone will be deleted so kindly make a back up. Kindly rate us in fixya if i am helpful
Check your sim compatment to see that the sim is properly fixed and as for the offline press the read button on your phone it will bring out the options just click on online on the options and your phone will be back to online
Tap the power button once (do not hold it too long, because it will turn your phone off). Just choose any profile, and your phone will go to online mode.
You can switch it anytime to offline mode, in case you want to use your phone and be unavailable at the same time, by doing the same thing - tapping the power button, and selecting offline mode/profile.
If this helps, please rate.
change the offline mode,then you can check it with other sim card ,if it remains the same problem ,it may be locked to particular network wont accept any sim card other than the particular network ,you can unlock it and used to other network,try here http://www.superunlockcodes.com/nokia-e75/rs12wp9/
I couldn't find the above menu items however i found an alternative: press the on/off button on your E71 and select General. The phone will then ask if you want to change from offline mode and allow network access.