hmmm
been with 3 for almost 2 years now and the signal is on and off where ever u go around the country. The tinternet with them is ok but not the best unless u are by a mass even then its not great.
I have a mass 100Meters birds eye view to my house , and still don’t get full signal strength, I go sit as close as I can to the mass (approx. 5 meters away ) and I still don’t get full speed H+ internet, and the signal drops and sometimes switches back to “E” (edge) then goes back to H or H+.
Sat on at bournmouth beach by the BIC centre and was topping out at 30Mbps down with over 100Mbps upload speed?? 
3 don’t transmit at full power as other carriers do, or are capable of. Carriers also share the same mass 90% of the time.
heres a few handy hints ive found usefull for the 3 network internet wise.
- link to search for the local mass. - sitefinder.ofcom.org.uk/search
- If u want to get unlimited tethering without paying then setup a wifi hotspot on your phone then use a 3rd party wifi hotspot app which then bypasses 3’s network settings which prevents u to tether. Heres a link to the one I use for android.
play.google.com/store/apps/deta … spot&hl=en
They don’t offer unlimited tethering no more as only 3 months ago I wanted it, but was told its £5 for 1gb, so politely told them where to go. So to setup the best way to unlimited tether is…
1st. setup a mobile hotspot on your phone, with the choice of your own SSID ( hotspot name ) and password. -
2nd, when that’s done then turn off the tethering on your mobile and download the app in the link I provided.
3rd, when installed click on it once it should bring up your pre setup hotspot settings - just say yes or confirm - then that new app will use your pre defined settings.
4th, u only need to tap the app once to turn it on and it will run in the background, if no device is connected via your mobile then it will turn it self off.
Doing it this way the app will bypass the 3 settings for tethering and u will be able to browse the net on your mobile and on any device u choose to connect to it wirelessly.
I have been tethering this way now for 3 months and my bill remains at £28 as per my price plan, so I can accurately say 3 don’t notice. I also play games like this via the laptop through the mobile hotspot
YOU MUST HAVE UNLIMITED DATA ON YOUR 3 PLAN IF YOU CHOOSE TO DO THIS!!!
Hope this helps you and fellow 3 members… + don’t forget now, its free to roam in any EU country now on 3 as with any other network BY LAW !!