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iPhone has always been one of the best smartphones today, not just because of its powerful configuration, outstanding design, but also because it brings many applications for users.
Even for long-time iPhone users, you may still not fully understand all the features on this premium smartphone, and the USSD codes below are a prime example.
USSD codes on iPhone
Activate Field Mode: *3001#12345#*
To access the iPhone call function, dial *3001#12345#* and press call. Your phone will switch to Field Test Mode.
Look at the signal bar (usually indicated by 1 bar, 2 bars...). It now displays a negative number ranging from -40 to -130. The closer to -130, the weaker your signal. If it's -130, you've lost signal completely.
Activate Phone Test mode: *#0*#
In the phone dialer app, dial *#0*# then press call. Your phone screen will switch to the device test interface. Tap on each letter box to test each function from camera, touch, to barcode.
Change your device's IMEI code: *#06#
IMEI is like an individual's ID number, unique to each phone on the market. To check your phone's IMEI, simply dial *#06# and press call.
Check call forwarding number: *#67#
In case the person we call is busy, and we use call forwarding service to redirect the call to another number, to know this forwarding number, you just need to dial *#67#.
The call forwarding number is set by the user in the call settings on each phone. Additionally, some carriers also provide voice message services when you cannot immediately answer a call.
Display outgoing call information: *#61#
Similar to *#67# on iPhone, for Samsung Galaxy phones, we use *#61#.
Check mobile services on your phone: *646#
To check available services on your phone, simply open the dialer app and dial *646#, then press the call button.
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