Go to Menu> Settings> Phone> Operator selection> Manual. Now your phone will search for available operators. Select any other network except your own network (i.e. If your r using Airtel, select Vodafone in). You’ll get an error message ‘No network access’. Now, look at the signal bar. It is empty! But don’t press back. If you press back, the phone will capture signal again. If any caller calls you then, he will hear that your phone is out of network range! This trick works on almost every Nokia s40 handset, hope will work on others phones.
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