SECRET IPHONE CODES X @cooltechtipz (Learn Something) *#31# - Block your number #31#Phone number + call - Block number for call *#06# then press call - Get your IMEI number *3001#12345#* - Get a more precise signal strength *#21# - Decline calls without them knowing *#43# - Turn on/off call waiting *646# - Check how many minutes you've used *225# -