A flight attendant uses two phone tricks to check for hidden cameras as soon as she enters a hotel room.
Hidden cameras in holiday rooms are a concern for some travellers who are understandably uncomfortable with the idea of being filmed against their will.
This may be a particular concern when staying in a holiday let apartment owned by a landlord who wants to keep an eye on their assets, the Daily Express reports.
Esther, a flight attendant and TikToker, has explained how she starts by checking the mirrors.
To find out if there is a hidden camera behind the mirrors, simply touch the glass with the fingertip and pay attention to the contact point.
If there is a gap of centimetre or so between your finger and its reflection, the mirror is functioning as normal, according to security website Ddcountermeasures.
However, if the finger and reflection touch, "there is something fishy about the mirror", according to the security company.
To check if it is a two-way device, you can turn off the lights and press a torch onto the glass to see if there is a room on the other side.
In a recent video Esther then moves from the mirrors to the bathroom, where she inspects the shower, before checking out the fire alarm, TV and curtains using the torch on her phone.
As hidden cameras have lenses which reflect light, an easy way to find them is to close the curtains, turn the lights off, and use the phone’s light.
You should be able to spot the hidden camera's reflection.
It may take some time to find, as the reflection will only be spotted when the lights hit the lens at the right angle.
Travellers can also spot them just using their phone's camera.
Spy cameras use infrared illumination for filming in the dark, according to security experts at Kaspersky, which is invisible to the human eye but not a phone camera.
"When filming in the dark, the infrared light source will appear on the screen as a pulsing dot," the security pros explained.
"Keep in mind that your smartphone’s main camera may not do the trick, because it probably has an IR-light filter, so the front camera is a better bet.
"You can experiment with a TV remote to find out if your smartphone is good for the job. If your suspicions are correct, you will see a glare on the smartphone screen.
"If you can’t use the phone’s camera and flashlight simultaneously, use a separate flashlight."