No matter how you acquire Bitcoins, it will likely not be anonymous. This section highlights a few options for acquiring Bitcoins that are relatively private, or at least not overwhelmingly invasive. To increase your privacy, do not carry devices with you that have SIM cards in them, and never log your location with GPS.
ref: https://www.techradar.com/how-to/draft-how-to-buy-bitcoin-anonymously-well-almost