Has anyone had luck defeating Find My Phone on iOS in terms of making it appear you are somewhere else?   I’ve looked into a few options but they seem janky and unreliable. Turning it off is not an available option for me. Any helpful replies are greatly appreciated.

Get a second phone that is an older model or a burner phone to use for your illicit activities in P4P.  These are generally not trackable unless additional apps have been added to the original configuration.

Reading between the lines, he has a suspicious SO. Findmyphone may even work with power off, depending on the app. It would be equally suspicious if he left his RL phone at home. Might work if he leaves it at the office or gym locker.

Before he leaves work or gym, put the phone in a faraday bag. The other problem are hidden apple air tags.  There is an application to find those.

Can you park several blocks away and leave the phone in the car?

If a suspicious SO, I'd suggest cooling it for a while. Once they are on the case like Sherlock, a phone app is not the only iron she has in the fire.

This is what I do. I have two iPhones, one being my main and the other we'll call it p4p. One thing that you want to understand, is that across all iOS devices, messenger will receive messages across all devices. Also sending a message through messenger, the recipient won't know which device is sending because its all under one apple account. So if I text my wife(she also has iphone) on my P4P iphone she thinks the text is coming from my main phone. Also on day of, I forward my phone calls from my main to P4P so that any calls to my main will go straight to my P4P.  

I agree with others that you are probably using a separate hobby phone but are concerned about someone using FindMyPhone to "track" you even if your iPhone is on you or near you. And the tracker (your SO?) expects to see your phone moving around or stationary at a "known" (office, gym, golf course, ...) location.
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The "forgot my phone and left it at the office" or gym, golf bag, or a bar or restaurant or your lawyer's office ... seems like a good idea to me but I don't know if it fits your circumstance. You'd need a cooperating friend: "Keep this for me, will ya? I'll be back in a couple of hours to pick it up." AND, it probably has a expiration date: "Again? You forgot your phone AGAIN? You NEVER forgot your phone and always had it with you for the past 20 years!! Have you gone mental?"
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Right out of the standard movie spy book: Give your phone (or phone your your briefcase) to a friend and tell them to drive around for a while ... and make sure to stay out of the sleazy neighborhoods (or other restrictions you have).  Then, tell them to wait until time = X and "Call my SO and tell her that I forgot my briefcase at your office [or restaurant or ...] and I can pick it up any time." ("WHAT? You forgot your phone AGAIN?")
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Leave your LOCKED phone on a bus or subway and it will create a trail going all over the city. Claim from Lost and Found or, even better, tell your SO to help you FindMyPhone: "It's where? ... Google maps says that's the subway car maintenance facility at the end of the line. It must have slipped out of my pocket on the way home. ..."
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Strap it to a dog or other reliable pet. When ready to reclaim, give a whistle, recover your phone and give the dog a doggie treat for the favor.  
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You might even try attaching it to a swallow to carry all over your city / location.  
"African or European?"  
http://www.youtube.com/watch?v=w8Rn_f75UHs
Of course, they would also have to trained to return to their coop so you can recover the phone later.  
http://www.youtube.com/watch?v=KxwDnypJw3Y  
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Silly ideas ... but maybe one of them will work ONCE.

This sounds like the best option. The caller doesn’t know their call is being forwarded?
Thanks to everyone for the input.

I remember the Breaking Bad episode where the wife discovers that Walter White has a second phone..  

There's no way the person who is calling will know if their call is being forwarded. Also, try calling you SO sometimes from facetime audio. The only thing you can't do is calling your SO from your p4p. The p4p number will pop up on callerID. The solution is to use facetime audio. So if you do it beforehand your SO won't think anything of it if it happens again.

Wouldn't it be easier that before you go you scout out the location (ie: google maps), find a landmark, and then call your SO and say- grabbing a quick bit at McDonalds, then go upstairs for the hour?

Well you see here, I live in GA and most apartment complexes aren't above a McDonalds. Also everything is spread out here and the agencies I frequent aren't anywhere near a restaurant. Do you know how massive these apartment complexes are here? And what if she decided to check in during the middle of a session and see's your location at an apartment? Yeah I'm not taking that chance to save a $50/month. But you do you sir.

Fantastic idea —  I may try it as well  

So then get a burner, and leave your iPhone in your desk at the office while you see a lady. If you miss her call, well honey I was in a meeting. Seems pretty simple to me.

It was his WIFE.  I understand they are much more dangerous.  Lol

He said it was the guy's wife.

Again, works best  if both have iphone and it costs the same as burner. You can't call your wife on burner😂

That’s basically what he’s saying to do, as far as leaving his real phone at the office or some other place he’s “expected” to be. The difference is just that the “burner” is one that lets him remain in contact with the wife and pretty much anyone else who needs to get ahold of him.  

How could they get your name that you never used it for business or property tax purposes? The cell provider doesnt give out names based on phone numbers. I mean Popo probably could with a warrant but not a SB.

I guess it would have to be a separate carrier and not another line with the same carrier ?

Green message bubbles??

Faraday bag makes the most sense! They're available on Amazon and they're  cheap. I think I'll get one and try it out.

that she's tracking his phone, won't it get her attention if the phone suddenly drops out of site?

Exactly.  

given he even said turning the location service off was not an option. LOL

If she’s watching him that closely his problem is way bigger than finding a way to sneak around to see a hooker. Maybe he needs to join a country club or yacht club or something that would explain him being off the grid for a few hours.  
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Or maybe just bite the bullet and cut his losses now before she catches him.

I never did any mongering or cheating while I was married. Never gave her a reason to be suspicious. But she always wanted us to share location with each other and she would frequently try to text me or whatever during the day. We had the conversations about boundaries, when I’m at work I’m busy and my time belongs to them, don’t call me unless it’s an emergency, etc. but it didn’t do much good. She still would want to be in touch during the day. I’m pretty sure she only ever checked my location when I didn’t respond quickly. I really don’t think she was suspicious I was cheating, she was just codependent. I never got the “where were you what were you up to” talk, it was more like “don’t ignore me I’m important.”  

to confirm where YOU were so that she would not run into you while she was seeing her boyfriend.  I've met a few married women who were like this.  

Do the phone thing, If someone calls me from a VOIP, I won't book them. Let me tell you why.  About once a year I get a KID,  A LOON, or just someone with WAY too much time on their hands, booking, not showing up, then start with the Voip #s. It is sad that people are not grown enough to act like they have some sense at this point in their life, but understand , we get those fools. That is valuable time & I've got others that want that time. If someone cancels on me, I will still book them again, but they won't be priority. B/C at that point they are risky. But if they just don't show, I'm done. But all I have is their phone #, so I just block it, or program it as "No:.  So, that is where the game starts. They got mad b/c of something they did, or it's just a random juvenile. I had one using a voice changing app. Busted him. Sometimes people forget our time is valuable, and we are trying to book people that prioritize us & show up.

But won't a prepaid legit phone show up the same way?

LoL I’m not so arrogant as to say that’s impossible. I really doubt it but I also know that I can’t really know, ya know?

Buy another phone just like the old phone and switch the number over to the new phone.

Same deal w/ Android. There's probably a workaround but I try to keep it simple by leaving the phone in the office & forwarding calls to a burner. It means I won't get texts & limits where I can go and for how long but it's better than nothing.  

This is a good idea.  Or leave it at a gym and take up swimming.  Buy goggles and swim trunks,  Can't answer a phone when swimming.

Just give up the hobby and dont cheat on your wife. One hour of pussy is not worth your marriage. Just my two cents.

so I came across an app online callled "iWhere Iphone location changer" and it costs $49.99 for life. It is not in the app store- wondering if anyone has tried it.

Cmon bro don't cheat on your wife. Either get her to agree with you doing the hobby or quit or break up with her.

I'd venture a guess that it's a majority. Anyway, I'd be hesitant to give them advice like this. It's an over-simplification to say either get her permission, quit or break up with her. Until you now someone's actual real-life situation (which is impossible) I wouldn't give them advice on what to do.
And, just for the record, I never cheated myself. I just try not to judge those who do.

First of all It does not matter if anyone cheats. Secondly, If anyone has to track someone else's phone for whatever reason, then that person that is tracking the phone then he/she does not need to be with the person he/she is tracking.

Simple process