SMS update.

You may have to go on line to find a more comprehensive menu. The battery is only meant to be a short term backup and the IHD should be plugged into the mains supply for normal operation.

Now with the batteries in and powered try switching the unit off then on again by switching off by holding down the on/off button for 30 seconds. This is the repeated advice I got from my supplier.

The wrong costs are likely to be because the meters haven't been updated with the costs rather than the display holding that information. This is the problem I had with the April changes of tariff where the gas price updated OK but it took 6 weeks and multiple emails for the electricity to be sorted. Subsequently both meters updated quickly with the October tariff changes.

I don't fully understand the details or system at the suppliers end (or the 3rd party relaying the information) but from a fairly detailed email from a helpfully member of my supplier's support staff there appears to be two systems supporting the update of meters and my electricity meter only got the correct tariff information when I was swapped over, after a the support staff had first requested a few updates via the other system. Even when I had the wrong tariff being reported the meter was still supplying readings at a 30 minute resolution to my supplier.

Is this network button for connection to a router? If so you may have to press a WPS or connection button on the router to make it discoverable for a minute or two just before using the connect to network option on the IHD.

In my case for new wi-fi items... I have the wi-fi filter on my router set to only accept the MAC addresses of my equipment and new or spurious equipment with a different MAC address is denied access. I first have to turn off this filter before connecting new equipment via the WPS method and then switching the wi-fi filter back on after the new equipment has been detected and the MAC automatically added to the filter list.

Who do you think this protects you from? It's trivial for a device to send a fake MAC address, in fact most phones randomly change their MAC address every few minutes (to stop them being tracked by "free" instore wifi).

Strange how my phone always connects to my Wi-fi then, presumably because the filter is accepting all the random MAC addresses the phone is generating?

Depends how old your phone is (android 10 or newer, iThingOS 14 or newer) and whether you've disabled MAC address randomization for your SSID?

My android phone has an unalterable MAC address it uses in connecting to wifi targets.

What makes you belive that?

The fact that its greyed out .

And that it never alters in my DHCP table

That's the advice they give everyone. Except this one doesn't have an on/off button, unlike the old one. But of course I've tried all the ways to do a reset.

There is a connect to network setting in the menu. Tries, then give up. Many many times. And resets the clock to 1200. The old one found the correct time itself.

The old one had a connect to Wi-Fi which I did. Not sure if it made any difference. New one doesn't.

I've never heard of a smart meter or IHD connecting to wifi.

Mine has no actual on/off button, but pressing and holding the OK button causes it to ask whether to restart it.

IHD Version 7 instructions

Connecting your In-Home Display to your Wi-Fi Network If your energy supplier has provided you with a CAD, or cloud-enabled Smart In-Home Display, you can connect the IHD to your Wi-Fi network. This will enable your energy supplier to securely deliver remote updates to the IHD and monitor how it is functioning. Depending on your energy supplier, you may also be able to view your energy data via an online portal or mobile application, which will help you to better understand your energy usage. To connect your Smart In-Home Display to your Wi-Fi, press MENU, then use the arrows to scroll through to SETTINGS and press Wi-Fi. Turn your Wi-Fi option on using the ON/OFF button on your In-Home Display and choose a method with which to connect to the Wi-Fi. You can connect to the Wi-Fi through four different ways: Scan for networks, WPS Push Button, WPS PIN number, or Enter Network Name. Select the method you would like to use to connect to your Wi-Fi network by tapping your choice and following the instructions.

I've just had cheap smart plug fail to detect my network.

Solution: The plug only works over Wi-fi @ 2.4GHz but my router operates on both

I had to go into the setup for my router and turn off the 5GHz channel. The smart plug then had no problems detecting and connecting to the router.

I then went back into the router settings and re-enabled the 5GHz channel. The smart plug still works.

My original IHD did. And had to enter the Wi-Fi pass code. But appeared to do nothing at all.