These are almost always scams

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Cryptocurrency Exchanges (Limited Phone Support): Major cryptocurrency exchanges where you buy/sell Bitcoin (like Binance, Coinbase, Bitget, CEX.IO, etc.) generally do NOT provide public customer service phone numbers for direct voice calls. This is a crucial security measure to prevent phishing and scams.
Primary Support Method: Their primary support method is 24/7 Live Chat and Support Tickets accessible through their official websites or apps. This provides a written record bitfinex user phone number list and is more secure.
Scam Alert: Be extremely wary of any phone numbers found online claiming to be "Bitcoin support" or "crypto exchange support." designed to steal your funds. Exchanges will never ask for your private keys, seed phrases, or remote access to your computer over the phone.
Legality in Bangladesh: like Bitcoin are not regulated and generally discouraged/unofficial in Bangladesh by Bangladesh Bank (the central bank). While there's a "thriving underground market" and apps like Binance are accessible, official support or easy access to phone number data for crypto users is non-existent.
No "Data" Available: There is no legitimate or legal way to obtain "phone number data" of individuals who own or trade Bitcoin. This would be a massive privacy violation and highly illegal.
If you need support for your Bitcoin (BTC) on an exchange:

Always go directly to the official website of the exchange you use.
Look for their "Support," "Help Center," or "Contact Us" section.
Utilize their official Live Chat or Ticket submission system.
Never trust phone numbers found in random online searches or unsolicited messages.