Three HomeSignal femtocell for bad coverage

My flat has terrible mobile coverage. It’s okaaaay-ish in the living room and dead in the bedrooms, and it’s infuriating. You might be thinking, but Stuart! you live right in the centre of Birmingham! surely coverage in a city centre would be amazing! at which point you will get a look like this


and then I will say, yeah, it’s something to do with the buildings or concrete or something, it’s fine when you’re outside. It’s an old building. Maybe they put copper in the walls like in the Rookery or something. Anyway, whatever, it never worked, regardless of which operator you’re on. So, when I moved in, I contacted my operator, Three, and said: this sucks, do something about it. They said, sure thing, install our Wi-Fi Calling app, Three in-Touch. Which I did, and managed for two years.

I say “managed” because that app is terrible. The UI is clunky, it doesn’t handle picture messages, there’s no way to mark a message read, the phone call quality cuts out and breaks all the time, and most annoyingly when you get an SMS it shows a notification but doesn’t play a sound, so I have no idea that I got a notification1. I’ve missed loads of SMSes over the last couple of years because of that.

Anyway, the Three In-Touch2 app popped up a little dialogue box last week:

We are updating our network. From 15 May 2019, the Three inTouch app will no longer be supported. Your call history and SMS sent or received will remain visible but you will no longer be able to make calls or send or receive SMS through the app. If you delete the app, your call and SMS history will be lost. WiFi calling is already built into most handsets these days and will continue to work in any enabled handset without need of the app

Ah, thought I. WiFi calling is already built in, is it?

You see, there’s a problem with that. On iOS it’s built in. On Android, on a lot of phones, it’s built in only if you bought the phone from your carrier, which I never do. It needs some special bit of config built into the firmware for wifi calling to work.3 So I thought, well, I’m screwed then. Because Three won’t update my Z5 Compact to have whatever firmware it needs to do wifi calling, they’ve killed the (execrable, but functional) app, and I’m not buying a new phone until the phone industry stops making them the size of a football pitch.4 I got on the live chat thing with Three, who (predictably) said, yeah, we’re not sending you the firmware, pull the other one, son, it’s got bells on.5

And then, a surprise. Because they said, howsabout we send you a Three HomeSignal device? It’s a box that plugs into your wifi and then your phone sees it as a phone antenna and you get good coverage.

And my brain went, what, a femtocell? A femtocell like I asked you about when I first started having coverage problems and you swore blind didn’t exist because everyone has wifi calling now? One of those femtocells?

Having been taught to never look a gift femtocell in the mouth, though, I didn’t say anything except “yes please I’d like that, cheers very much”. And so it arrived in the post two days later. Result.

However, the user guide leaves a bit to be desired.

The Three HomeSignal user guide, which says to plug in the ethernet cable and the power, and does not at all mention that it also needs a SIM card

I do not know why the user guide completely ignores that you need to also plug a SIM card into the HomeSignal device, but it does in fact ignore that. You should not ignore it: you need to do it, otherwise it doesn’t work; you’ll get an error, which is the LED flashing red five times, which means (in the only mention of a SIM anywhere in the user guide) “SIM card problem”. At which point you think: what bloody SIM card?

More confusingly still, Three include two SIM cards in the package. One is a Pay as you Go SIM. This is not the one you want. I don’t know why the hell they put that in; fine, if you wanna sell me on your products, go for it, but you made the HomeSignal process a billion times more confusing. The SIM card that goes into the HomeSignal device is on a special green card, and it says “HomeSignal device only” on it. Put that one in the HomeSignal box. The other one, the Pay as you Go one, you should sellotape it to a brick and then send it back to Three, postage on delivery.

Once you’ve done that, it works. So, Three, if you’re listening: one bonus point for finally deciding to update the awful Three in Touch app. Minus twenty points for not having a replacement for people who didn’t buy phones from you. Plus another twenty points for offering me the Three HomeSignal femtocell which fixes my problem. Minus a little bit for the bad instructions which don’t say that I have to put a SIM card in, and then minus quite a lot more for putting two SIM cards in the box when I do finally work that out! So, on balance, this is probably about neutral; they have fixed a problem I shouldn’t have and which is partially caused by phone manufacturers, using a technically very clever solution which was confusingly explained. Business as usual in the mobile phone world, I suppose, unless you’re using an Apple phone at which point everything works really smoothly until it suddenly doesn’t. One day someone will get all of this right, surely?

  1. They have had, looking at the internet, this reported to them about six hundred billion times
  2. they don’t seem to be anything like consistent about the spelling and punctuation of the name of this app, so I don’t see why I should be either
  3. It seems like this might be fixed in very recent versions of Android? It’s not at all clear. This problem is of course exacerbated by not getting system updates unless your phone is less than a week old.
  4. I saw a bloke on Twitter the other day say rather sneerily, I bet all the people who are mocking folding phones like the Samsung Fold now also mocked the Samsung Note until they realised they like big screens after all. No, sneery bloke. I mock the folding phones now for being a (terribly clever technical) solution in search of a problem, I hated the huge Note when it first came out, and I hate all huge phones now. For god’s sake, phone industry, make a small flagship phone. Just one. I suppose it’ll have to be an Xperia Compact again, but it’d be good if there were competition for it.
  5. They also said that they’re rebuilding the Three inTouch app to be good and work with 5G. Apparently. At some unknown point in the future. I carefully did not point out that if you’re building a replacement for something then there needs to be overlap between the two things rather than an interregnum during which every user is screwed, because that information needs to go to their project manager rather than their support team, but to be clear: to whichever project manager thinks this is an acceptable way to do deployments, I hope someone hides snakes in your car.
I'm currently available for hire, to help you plan, architect, and build new systems, and for technical writing and articles. You can take a look at some projects I've worked on and some of my writing. If you'd like to talk about your upcoming project, do get in touch.

More in the discussion (powered by webmentions)

  • Ross Burton responded at Curious about those, partly as a way to get my inlaws to have signal. Does it literally appear to be a mast to the phone so calls/sms/etc are transpar…
  • Stuart Langridge responded at As far as I can tell, yes, that's exactly what it does!
  • Ross Burton responded at
  • Stuart Langridge responded at Ikr! It's a really good idea! My parents don't need it because they both bought new Samsung phones from Three, so WiFi calling works for them, and my…
  • ThreeUKSupport responded at we're glad that we got this sorted, Stuart 😀👍 is the signal in your house a lot better now? >RG
  • Stuart Langridge responded at it is, so far, based on my testing. I do have a question: it should still work and give me good phone coverage even if my phone is connected to wifi,…
  • Terence Eden responded at
  • Ross Burton responded at MIL has a Nokia Windows phone so hahahahah wifi calling 🤣
  • Paul Freeman responded at
  • Birmingham.IO responded at Stuart Langridge: Three HomeSignal femtocell for bad coverage by @sil #PlanetBirmingham
  • Martin Alderson responded at the issue you have is your phone doesn't support Three's 800MHz 4G band. Or more accurately three doesn't support use of the 800MHz bands for phones t…
  • Martin Alderson responded at or switch to @VodafoneUKComms or @O2 which allow access to 800MHz without VoLTE (as they have 3G @ 900MHz for CSFB, whereas 3 and EE only have 1800MHz…
  • Stuart Langridge responded at Thank you! That's useful information; something to bear in mind if and when I do look at switching.
  • Leaky responded at This isn't the answer... Android does support WiFi calling, three need to work with the device manufacturers to get their network config mapped to the…
  • Stuart Langridge responded at There doesn't appear to be any way on my Z5 Compact to turn wifi calling on, with the stock firmware. It's not that I've got it but it doesn't work. I…
  • Stuart Ward #LeadNotLeave responded at So why not just use Signal or whatsapp that work over the data connection? Do you still call real phone numbers?
  • Stuart Langridge responded at Yes. All the time. And real numbers call me.
  • Edward Millen responded at
  • Drei aka Bitcoin Master responded at Folding... ( I lol’d when Stuart said folding phones are a solutionin search of a problem.