No signal indoors

[JoSa]

I suddenly lost a signal inside my house. I cannot make or receive any calls. O2 gives a different information about the signal issues in my area (GU10 4NN), one that there isn't any and another that there is an issue with the mast. The latter one has been on a website for at least ten days now, so I do not think is true. My phone works outside my house. Indoors, it does not even list O2 as an available network. It lists Vodafone and EE, and my foreign SIM cards connect to these with no problem.  It might be a silly question, but I recently replaced windows in my house. They are thicker than the old ones, but nothing exceptional or bulletproof! Could it be a reason for the loss of signal? And if it is, what can I do about it, apart from switching to Vodafone or EE?

[MI5]

Who is your ifi provider @JoSa ?

[japitts]

There's a reliable way of proving whether your windows and/or any in-building loss is the cause of your issues - use a suitable Android app to check the eNB/PCI-ID of the serving cell outdoors, and then repeat the checks indoors.

If the same eNB/PCI is evident in both cases, and the RX levels are below accepted levels indoors.. there's your answer.

Or open the window, hold the phone outside, then pull it inside and close the window. See what happens to the signal indicator. You can't 100% guarantee the same serving site throughout, but you'd be unlucky not to.

If VF & EE both work indoors, I would guess their serving site is closer to you than O2's. Quite often VF & O2 share the same sites via CTIL, but that doesn't necessarily extend to the same frequency deployment.

@MI5 wrote:

Results of a simple Google.

No experts needed.

To improve your mobile reception, you can try opening a window or using a repeater. A repeater works best when there is a good outdoor signal that can be boosted indoors. 

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There's a good reason to not use "simple" Google searches or other automated answers....