This raises ethical and Legal Questions

[badsha0016]

When you grant an app access to your contacts, you're not just sharing your own data, but also the personal data of everyone in your contact list, potentially without their consent. , especially under data protection regulations like GDPR.
Phishing and Social Engineering:

Contact lists are valuable targets for attackers who want to perform targeted slovenia phone number list phishing or social engineering attacks. Knowing who you communicate with makes it easier to craft convincing fake messages.
"Sim Swapping" and Account Takeover:

If an attacker can acquire your phone number (e.g., through a SIM swap), they can often use it to bypass two-factor authentication for various online accounts (email, banking, social media), leading to account takeovers. The contacts on your phone might then be used to gain access to even more accounts.