Let me share with you more secret iPhone codes and what they precisely do: - Field Test Mode: Enter *3001#12345#* to access detailed information about your iPhone’s network and signal strength. - Check IMEI Number: Dial *#06# to display your iPhone’s International Mobile Equipment Identity (IMEI) number. - Call Forwarding Status: Dial *#21# to view the status of call forwarding for voice, data, fax, SMS, and other services. - Check Missed Calls: Dial *#61# to view the number of missed calls. - C