On November 1, 1976, RMN operated its first FM Station branded DXVM-FM 99.1. Its format was Contemporary Hit Radio & Pop music. It catered to C & D market.
In 1986, the station was reformatted as Smile Radio 99.1 "The Voice of Music".
In 1999, it was reformatted again as 991 VMFM "Live it Up!". Its format was CHR format.
On August 28, 2002, it changed its name to 99.1 iFM & catered to class B although it stuck to C & D market. 99.1 iFM almost has the same format with all the other iFM stations nationwide.
In 2013, in an all out effort to regain airwave supremacy, 99.1 iFM reinvented itself once more. With extreme pressure from management, all iFM stations are now gearing up to a more localized approach thus eventually coming up with local tagline and programs. As of this writing iFM is now using the slogan "Permanente!".
On November 9, 2015, iFM and provincial stations launched its new logo and slogan, "Ang Bestfriend Mo!"