What are the secret codes for iPhone?

There are several secret codes that can be used on iPhones to access various features or perform specific tasks. Here are some of the commonly used ones:

1. Field Test Mode:
   • Dial *3001#12345#* and press the call button. This will enter Field Test Mode, which provides detailed information about the cellular signal and other technical data.
2. IMEI Number:
   • Dial *#06# to display your device’s IMEI (International Mobile Equipment Identity) number.
3. Check Call Forwarding Status:
   • Dial *#21# to check if call forwarding is active.
4. Check Service Provider:
   • Dial *#30# to check if your caller ID is active.
5. Check SMS Service Center Number:
   • Dial *#5005*7672# to see your SMS service center number.
6. Call Waiting:
   • Dial *#43# to check if call waiting is activated.
7. Access Your Carrier’s Service Menu (may vary by carrier):
   • Dial *#61# to check your call forwarding settings for unanswered calls.
8. Check Your Phone Number:
   • Dial *#100# to get your phone number (works with some carriers).
9. SIM Card Status:
   • Dial *#5005*7672# to check your message center number (for SMS related issues).

It is important to note that while these codes can be useful, not all codes may work on all carriers or models, and some operations may have different effects depending on the region or carrier settings. Additionally, misuse of some codes could potentially disrupt your service, so it is advisable to proceed with caution.