If your OPN has firmware 4.0 installed (the latest), there should be several built-in profiles you can choose from, like Comfort, Speech in Noise, Music, Lecture, T-coil and Mic & T-coil (for the last 2 you’ll need the newer version of the OPN that has T-coil support).
Beside those listening programs, there’s also the Auto Phone program that I’d suggest you have enabled (it’s not enabled by default). If you have the T-coil version, then there are 2 phone programs -> Phone T-coil and Phone Mic & T-coil.
Here’s the way I set up my 4 programs:
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Default program 1 -> I have Speech Rescue enabled so that when I use my TV streamer, the TV Box mode will pick up the Speech Rescue feature as well (it picks up whatever setting you have in the default program 1).
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Program 2 is a copy of program 1 without Speech Rescue enabled. Sometimes I don’t want Speech Rescue like when I’m outdoors where Speech Rescue can pick up a cacophony of cricket sounds and bird tweetings which I normally wouldn’t hear unless Speech Rescue is turned on. So this program gives me some filter not having to hear those sounds if I don’t want to. It’s also helpful to have so I know which sound had been enhanced by Speech Rescue if I hear it in program 1 but not in program 2 then I know that it’s a lowered sound from Speech Rescue that I hear. For example with Speech Rescue, I’m beginning to hear all kinds of soft digital beeps from the fridge and all kinds of digital devices that I normally don’t hear before. So if I hear them in program 1 but not program 2 then I know that it’s a Speech Rescue sound.
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Program 3 has the built-in Speech in Noise setting. I also enable Speech Rescue in this mode 3. And I even increase the volume of the Speech Rescue sound to the max volume here, but that’s just a personal preference.
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Program 4 has the built-in Music mode.
You’re correct that the iPhone is not a specific profile. But while you’re streaming an audio app from the iPhone, you can triple click the home button to bring up the Hearing Devices settings and you can see all 4 programs (and the TV Box mode which would be the 5th program if you had paired your OPN with a TV Adapter 3.0) and you can select whichever of these programs and the streaming sound from your iPhone will pick up whatever settings set for these program. You can also control the mic volume from this menu, for example turn the mic volume down to 0 if you’re in a noisy car or restaurant to turn off all ambient sound so you can hear the streamed sound only.