Head asked to block mobile phone signals in school...

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Originally Posted by JJonas

When I looked into mobile phone detectors a couple of years ago, they would only detect a phone while it was communicating with its mast, which only happens every now and again or while a call is being made.

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Not true. When my dad was in hospital a while back, there were detectors at the main entrance which would scream if you had a phone on, regardless of what it was doing (and this was pre-smartphones).

Detectors would, of course, rely on the phone being turned on so unless you put one in every classroom, they wouldn't stop people turning them on and off as needed.

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Originally Posted by JJonas

In addition to this they would only tell you that there was a phone switched on in range of the detector they could not tell you the location of the phone.

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Certainly true.

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Originally Posted by sted

presumably the phone would go ooh a closer network point lets try and authenticate . . . damn im not allowed on that wheres the next closest cell

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In which case, that would be illegal interception of communications and possibly interference as well as it wouldn't be a legitimate cell operating on that frequency.

We have managed 3G data disabling on the following devices
Samsung SAFE (V2+)
LG (V1.0+)