If you have multiple SIM cards on your device, we support Caller ID, Spam Blocking, and SMS filtering on all SIM lines, even if you’ve registered on Truecaller with only one number. This is true if both your SIM cards belong to the same country. However, for cross-country multiple SIM cards, this functionality may not be reliable.
Currently, we don’t provide the capability to verify secondary SIM numbers on Truecaller, so your profile will be created using only one of your numbers.