Block different GSM network in TG

Hi I have an idea about blacklist in tg.

My question is:

1. Here in our country we have different network provider for gsm, in which if you make a call in each other network there is a charge. How can i block specific number of a specific network so that for example sim1 is network1 and wants to call sim2 which is network 2, but there will be a charge, how to block for example 09297878777, can I set it like 0929xxxxxxx. ?

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