Hi, after a frustrating few hours and searching this community pages then I saw there was known issues trying to get Smarty and Three (as same network) on MR600. I understand it's the way Three consumes band - "Archer MR600 supports band 3+7, while it does not support band 1+3 yet, that is why the MR600 with Three sim card cannot get 4G+ connection. " from https://community.tp-link.com/en/home/forum/topic/172058 .

I tested Three sim in Android phone no problems with reasonable speed... so I know this is not bad SIM or poor signal strength.

If I use Lebara (Vodafone based) then have no problems at all.

I have the latest firmware but just want to ask ... has anyone got Three to work? And can someone confirm if any plans to support? Please none of this BS about troubleshooting docs etc ... straight answer will suffice!

I do think this contravenes UK Sales laws that this is a known issue but not advertised on the packaging. If I don't get any reasonable response from Tplink then will raise with Trading Standards for their view ... as you can tell I'm not that impressed after paying over £120 for this.