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Long story short, I work with a lot of RF equipment, and it would be really convenient if I could have a phone that I could truly turn OFF instead of having to leave it a million miles away in a shield box. So either one with a true hardware off, if such a thing exists, or one with a battery that can easily be removed and put back in. Thank you.

It's OK if it's an older phone, at the end of the day I just need it for calling and texting.

(I found this question, however it's 3 years old: Android phone with removeable battery, SD Card, USB Host/OTG for ~100 - $150)

  • That might be a 3 year old question, but to be fair, any phone with a removable battery is going to be at least 2-3 years old. Unless you are looking for a feature phone and not a smartphone, then I suppose some might exist. Provide more specifics on what you are looking for. – user1691 Jan 2 '19 at 16:47
  • Are you saying that modern smartphones send radio signals even when fully turned off or in airplane mode? Or is your stuff sensitive to noise from DC/DCs inside the phone? – Jan Dorniak Jan 7 '19 at 0:01
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Despite that the majority of models these days have an integrated battery , there still are smartphones that can have their battery easily removed, like Samsung Galaxy J4

One easy way to discover some phones (but not all) is to use a site which has parametric search like Kimovil. Here's the page to see models with removable battery less than one year old:

Smartphones with removable battery released last 12 months

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It's funny how you tagged your question "smartphones", asking for this functionality. Practically all non-smartphones will be truly off when you turn off their power. So get a flip phone; or, if you need more functionality, there's plenty more advanced non-smartphones, such as Samsung Star 2, or a variety of Blackberries.

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