I have a contract with three, which gives me unlimited data me mobile is sg2 gti9001. Every time I try tethering I get a pop up saying I can't tether. I have tried several apps but with no joy. Does anyone know of any apps which can by pass three finding out when I'm tethering. Thank you yo all in advance.
Tethering on Three's (or most other UK telco providers) unlimited plans is against their terms and conditions. You'll have to switch to a plan that allows tethering or use an add-on. See their Tethering info page for more information. Also see their Terms and Conditions
However some phones will still allow you to tether, I'm surprised it doesn't work on the GS2. Did you buy it from Three? So the tether function still works, but when you do tether a Laptop, they send you a message?
Generally they detect mobile usage that comes from PCs and Laptops and then they ban you. But tethering to other mobile devices seem to work, and also if you keep your data usage low, they may not bother.
Another possible work-around is to try and spoof the user agent and trick Three into thinking that the data is being sent by a mobile device. However, this is not fool-proof and they may still be able to detect, for example downloading a windows update.
Just to be clear, I would still recommend you buy an addon or join a different plan which allows tethering. If you think the Terms and Conditions are unfair, file a complaint or switch telcos.
Information on Three's The One Plan
So it is possible to get the One Plan, for unlimited data and tethering.
And from Tethering Explained
See their Pay Monthly plans
I've solved the problem with this app
be careful to have only one apn for mobile traffic and remove the apn for tethering traffic.