Have you ever changed your mobile number just for the call charges?

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Nowadays the mobile service providers are lowering their call charges in order to gain more customers and to retain their existing customers. Have you ever changed your mobile number to switch over to another service provider to avail the low call charge plans?Else will you do so, if some other service provider is lowering the call charges than your current network service provider? If you have changed already, what are all the problems you faced by that change?