How to block the warning signal that beeps when I call premium-rate numbers?

How to block the warning signal that beeps when I call premium-rate numbers?

Come to any LMT Customer Centre and lodge a request. 

You can send a scanned request to [email protected].

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https://lmt.lmt.lv/en/helpdesk/additional-services/premium-rate-services/warning-signal

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Contact us or visit the nearest LMT Customer Centre.