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After extensive testing on the SM-A750F with One UI 1.0 and 2.0, these codes work reliably:

To use secret codes on your Samsung Galaxy A7 (such as the 2018, 2016, or original models), you simply how+to+use+secret+codes+on+samsung+galaxy+a7+2+work

Maya then tried *#1234# to check her firmware version — useful before attempting an over-the-air update. She noted the build number and cross-checked it against Samsung’s support page later that day. After extensive testing on the SM-A750F with One UI 1

To use these codes, you do not need special software. Simply: Phone (Dialer) Type the code exactly as written (e.g., The menu or information should appear automatically . If it doesn't, press the Essential Codes for Samsung Galaxy A7 or original models)

Provides real-time network information such as signal strength and band.