You likely also need to get a new phone to get phone OS updates, which are much more important than Sonos updates for your online health.

Isn’t it simply the case that 12 months after Apple withdraw their own support and stop updating their iOS mobile device (and are no longer providing any further security updates) that Sonos remove their own Apps administrative features - just so that any potential security risks are reduced.

Playback functionality is still allowed, but support for the device is eventually removed altogether (around about two years after Apple have stopped providing their support/updates) in order to keep any ongoing risks to a minimum.

I personally think that two years+ is a fair enough support period provided by Sonos, considering that Apple themselves are no longer supporting their own device in this case.

I’m not sure this is the case as Sonos s2 requires minimum iOS16 and Apple last updated iOS 15 on March 5.  
 

So anything older than the devices below are not fully supported then…

iPhone

• iPhone 14

• iPhone 14 Plus

• iPhone 14 Pro

• iPhone 14 Pro Max

• iPhone 13 

• iPhone 13 mini

• iPhone 13 Pro

• iPhone 13 Pro Max

• iPhone 12

• iPhone 12 mini

• iPhone 12 Pro

• iPhone 12 Pro Max

• iPhone 11

• iPhone 11 Pro

• iPhone 11 Pro Max

• iPhone XS

• iPhone XS Max

• iPhone XR

• iPhone X

• iPhone 8

• iPhone 8 Plus

• iPhone SE (3rd generation)

• iPhone SE (2nd generation)

iPad

• iPad Pro 12.9-inch (6th generation)

• iPad Pro 11-inch (4th generation)

• iPad Pro 12.9-inch (5th generation)

• iPad Pro 11-inch (3rd generation)

• iPad Pro 12.9-inch (4th generation)

• iPad Pro 11-inch (2nd generation)

• iPad Pro 12.9-inch (3rd generation)

• iPad Pro 11-inch (1st generation)

• iPad Pro 12.9-inch (2nd generation)

• iPad Pro 12.9-inch (1st generation)

• iPad Pro 10.5-inch

• iPad Pro 9.7-inch

• iPad (10th generation)

• iPad (9th generation)

• iPad (8th generation)

• iPad (7th generation)

• iPad (6th generation)

• iPad (5th generation)

• iPad mini (6th generation)

• iPad mini (5th generation)

• iPad Air (5th generation)

• iPad Air (4th generation)

• iPad Air (3rd generation)

Those immediately before the above listed products (that just missed out on the iOS 16 update) will be partially supported by Sonos for about a year (i.e. playback only and no Sonos system administration features)… isn’t that the case @Bumper?

This is true, but I believe this is different than what you said (quoted below), which is what I was responding to. iOS 15 is still getting updates but Sonos has dropped admin control. Unless I’m not comprehending what you are saying.

In any case OP’s phone is likely ~9 years old, so blaming Sonos for moving on or more likely being forced to move on by Apple is kind of funny.