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Old August 12th 20, 02:49 PM posted to sci.electronics.repair
bilou[_2_] bilou[_2_] is offline
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First recorded activity by DIYBanter: Dec 2019
Posts: 11
Default cell (mobile) phone detector

On 09/08/2020 16:06, wrote:
Please is there any gadget/circuit/App that can detect a mobile phone when ;
1. even when the phone is off but the battery is inside.
2. When the phone is on
3. when the battery has been removed
thank you.

I don't see why current steal protecting devices would not work with phones.
AFAIK they are based on the grid dip principle.
RFID devices don't need battery either and can provide much more
information.
Both solutions do not use destroying levels of RF energy.
Wrapping the target with aluminium foil is a good way to
render them useless.