@Joe08
Here is how you investigate and throw out a "surveillance net" - more or less in order.
Only go through this effort if you are not ready to leave her! If what you already know she did and her lying are too much for you then save your energy.
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1) Get any information you can from her phone.
a) Check her phone bill to see who she has been texting and calling, how much, how often etc. See if there are any numbers she has been calling a lot that are suspicious. Run the number(s) through a reverse lookup like spydialer (dotcom). Find out further information through fastpeoplesearch (dotcom) and/or truepeoplesearch (dotcom)
b) Get her phone in your hand and look through her texts, any other messaging apps, photos and videos.
c) Buy the phone recovery software "Fonelab" and run a recovery on her phone to capture any deleted information such as text messages, photos, videos, cheater app messages, you'll also be able to see her notes, calls made and more.
d) Collect that evidence. and store it away safely. If you run a recovery it will be on your computer. Otherwise do it with screenshots that you send yourself.
BONUS:
e) If you have another apple device, you can add it to her iCloud account and then you will see all her iMessages, and if you do it correctly, her SMS messages as well, in real time as they appear on the device in your possession. Be careful, adding a phone to an iCloud account generates an alert on the main phone.
f) If she is on an iPhone see if you can get into her iCloud account and maybe you can retrieve her iMessages. Be careful, accessing iCloud generates an email to the account holder.
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2) Simultaneously get a VAR or two (Voice Activated Recorder)
a) Get a couple of VARs (Voice Activated Recorders) the Sony ICD-PX470 is the sweet spot $50 at Amazon, put one in her car and keep another around to record her in the house.
The point ehre is to hear what she says when you are not around, particularly afer you confront her and she is panicking. That is when cheaters run to their car and call their affair partners and partners in crime.
b) Read the manual for a couple of minutes and you will learn how to turn off any kind of beeps or lights.
c) Get a ton of triple a batteries, Amazon brand (about $14 last I checked.)
d) Get a Sandisk 32 Gigabyte MicroSD card for each VAR, about $8 on Amazon and you'll have dozens of hours of recording time.
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3) Implement phone monitoring
A) Implement some kind of phone monitoring service: mSpy, ikeymonitor, cocospy, Flexispy, webwatcher, there are a ton of them.
These services allow you to monitor all kinds of phone communications in near real-time.
If you go this route you don't have to add a phone to her iCloud account.
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4) Make her give you a no-bullshit, no lies, no excuses, no blaming you detailed timeline
a) If she wants to stay with you demand a detailed timeline that she will write immediately
b) Tell her you reserve the right to verify it via polygraph.
I would tell her after she writes the initial timeline and then watch her run back and amend the shit out of it.
Others might advise you to tell her prior to writing the timeline.