And do the MI's still advise against using a phone [holding it against the ear] when on charge?
I have no idea, I rarely read MI - I rely mostly upon my own common sense.
It was meant to be humerous following on from Winstons comment, I should have added a smiley face.
But yes MI's do state [or at least did when we got instructions with the kit] they should not be used when on charge.
If I understand what the OP wants, I'm not seeing any difference in operation between it and MIFI - Mobile (w)ifi. A mobile sim in a gadget which provides a wifi access point, it needn't just be wifi, it could be used for a wired LAN and they are licence free. I don't think it would be possible/ legal for him to set up a mobile access point of his own, but he could use VOIP to make and receive calls, via his wifi.
I have a MIFI here, which I sometimes use to provide wifi in my caravan whilst away.
Likewise I agree there is no difference between a MiFi and wired LAN version, or for that matter a USB stick version. I have several of all languishing in boxes somewhere but mostly from 2G & 3G days for when working on sites with no other conectivity.
Sure - as I said, that is also my understanding, and that what Simon was talking about (in relation to licensing/legalities) would not be relevant to the OP's requirements.
Kind Regards, John
Unless the licensing rules have changed, these are not licence free devices, the licence for such a product is held by the service provider and extended to the user under the service agreement. In the same way as a taxi service [for example] hold one licence and each operator is granted use of it.
So effectively your comment is correct.
They do exist - I came across them a few years ago. However, they are not legal to use (by any rational reading of the rules) without the involvement of the mobile company since they involve transmitting on frequencies licensed to the networks.
Basically, outdoor antenna (or set of antennae), indoor antenna, bi-directional RF amplifier. I guess the hard part is not creating an oscillator
Not a problem there are many channels available and all devices hop between them all the time.
Effectively the 'repeater' acts just like a phone but instead of having a microphone and loudspeaker [and all the other bits/facilities] it has another base station attached to it which then talks to the users phone to negotiate a working frequency.
Realistically some of the mobile network works in a fairly similar way.
One of the companies I worked for owned a fully licenced portable mobile phone 'repeater' as much of our work was in basements where phone coverage was non existant. All we had to do was get a NOV for each deployment.
Our phones had to be registered to it to prevent it being used and therefore monopolised by other users, it confused the hell out of them as they saw full signal but had no service, whereas we did.