http://valinet6l6tq6d5yohaa6gdsf2ho4qcqcxyj2nahp5kd4z7nsa6ycdqd.onion/2015/06/17/Why-am-I-leaving-the-Windows-Phone-platform-for-good-today.html
This way, interfaces like S60, Series 80, Series 90, ICQ, MOAP, OPP and others appeared, yet it was S60, which was backed by Nokia, which took most of the market, as Nokia was back then the leading phone manufacturer in the world.