No Internet

LET Router

You need a LTE Router (4G Router). You can buy from following links

Amazon

Currys

Data SIM

you need a data sim card.

When you purchase, you have to do

Insert the sim to your phone.

Turn off wifi from your phone.

Check if mobile data is working.

Setup

Connect two antennas to router device.

Insert the SIM card on the back of the router

Plug in the power cable

Press the power button to turn on

Booting will take a while (few minutes)

Wait until following lights are visible like shown in image below

1. Availability of internet

2. Wifi available

3. Signal strength (2 or 3 bars are ok)

Now unplug ethernet cables from BT router

then plug to LAN1, LAN2 LAN3 ports of the new router

Now check if the internet is available from POS tablet (go to bbc.co.uk)