Choosing the right privacy strategy depends on your calling habits, operational security needs, and cellular provider limitations. The table below outlines how each method functions across modern networks.
| Privacy Method | Scope of Protection | Activation Speed | Key Vulnerability |
|---|---|---|---|
| Carrier Dial Prefix (*67 / #31#) | Single call only | Instant | Fails if user forgets to dial prefix manually |
| OS Menu Toggle (iOS / Android) | All outbound cellular calls | Under 1 minute | Can be overridden or disabled by certain carrier SIMs |
| Carrier Account-Level Block | Permanent account-wide default | 24, 48 hours provisioning | Requires customer support or carrier web portal access |
| Secondary VoIP Numbers (Burner / Google Voice) | Isolates primary SIM entirely | 5, 10 minutes | Requires reliable mobile data connection or app routing |
