Usually 10 digits starting with 07 (e.g., 077 XXXXXXX , 071 XXXXXXX ).
Over time, the numbers inverted in the racing underground. A "Low Badu Number" became slang for a part that is beat-up, whereas a "High Badu Number" (allegedly referencing the cost in thousands) suggests high horsepower output. Sri Lanka Badu Numbers
Truecaller