*#1234# - model no *#0808#- USB options *#9900# - sysdump *#9090# - service mode *#0011# - gsm status *43# - call waiting enabled #43# - call waiting disabled *#43# - call waiting status *#62 - call forwarding status *#21×××××××××× - enabled call forward to x number Service mode *#2683662#
RF cal date refers to Radio Frequency calibration date. This is normally set during manufacturing or after a software update.
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