iFM for Griffin FM Radio for iPhone/iPod
Like many others I was disappointed when Griffin refused to update their ifm radio controller app.
I have found a way to still get FM radio on mi iPhone 6 ios 11.2.5 without the app. It's not perfect but it works. My Griffin dongle is WR1F-IPH5.
You need a set of ear-headphones with volume controls as the iPhone volume control does not work. Also frequencies do not appear on iPhone screen. After plugging the dongle into your iPhone you press the small white oval button on it which is on the reverse side to the description of the device.. First sound is white noise. Further presses bring up other radio stations in frequency order. Auto Lock must be set to “never” to prevent radio switching off after about 8 minutes. You soon get to recognise the radio stations. Happy listening.