How to find the spot with the best signal in your house

To find the best signal spot in your house, walk from room to room with a dBm reading on screen, stay still for about 30 seconds in each place, and note the typical value and network type. The spot with the highest reading that stays steady is your best signal spot. It is often near a window on the side of the house that faces the nearest mast.

What you need before you start

You need very little:

Your phone, with any thick or metal case removed for a fairer test
A way to see the signal in dBm, either your phone's SIM status screen or a signal app
A notepad or notes app to write down results
About 20 minutes

If you are not sure what dBm readings mean, what a good signal strength is in dBm gives typical ranges.

Why the best signal spot can be surprising

Signal does not simply fade as you move away from the front door. Radio waves bounce off buildings, pass through some materials and get stopped by others. That creates patches of stronger and weaker signal inside a home, sometimes only a metre or two apart.

A few things shape the pattern:

Direction of the mast. Rooms facing the mast usually do better.
Height. Upper floors often have a clearer path. Basements are usually weakest.
Materials. Brick, concrete, metal and coated glass absorb more than wood or plaster.
Reflections. A metal roof or a nearby tall building can push signal into unexpected corners.

How to find the best signal spot, step by step

Pick a fixed way to hold the phone. Hold it at chest height, flat in your hand, the same way for every reading. Changing your grip changes the result.
Make a list of places to test. Include every room, both sides of each room, window sills, the landing or stairs, and spots where you would actually use the phone, such as a desk or bedside table.
Start in one corner of the house. Stand still for about 30 seconds. Note the lowest and highest dBm you see and the network type, such as 4G or 5G.
Move to the next spot and repeat. Do not rush. The reading takes a few seconds to settle after you move.
Test windows twice: once right against the glass and once a metre back. This tells you whether the window itself is letting signal in.
Repeat the best three spots at a different time of day. A spot that is strong at noon and weak at 8 pm may be on a busy cell.
Run a quick speed test at your top two spots. Strength and speed do not always match, and you want a spot that is good at both.

Reading your results

Once you have your list, look for patterns rather than single numbers.

A difference of 10 dB or more between rooms is significant. That is roughly ten times the signal power.
Small differences of 2 or 3 dB may just be normal variation. Do not move your desk for those.
A spot that switches between 4G and 5G may feel worse than a spot that stays steadily on 4G.
One side of the house much better than the other tells you where the mast is. Use those rooms for calls.

If all your readings are poor, the issue is the building or your carrier's coverage, not the room. How to get better mobile signal at home covers the next options, such as Wi-Fi calling.

Make the most of the spot you find

When you know where signal is best, use it:

Take important calls there, or move a chair close by.
Leave the phone there while large downloads or backups run.
If you use a phone as a hotspot for a laptop, put the phone in that spot and let the laptop connect from further away.
If you have a 4G or 5G home router, place it in that spot rather than where it looks tidiest.

The same method works for Wi-Fi

You can use exactly the same walk-and-note approach for Wi-Fi to find dead zones and the best place for a laptop or smart speaker. The details are in how to measure Wi-Fi strength room by room.

How CellRadar helps

CellRadar shows your live mobile signal in dBm with network type, band and cell ID, and the optional live readout in the notification bar keeps the number in view while you walk. You can save readings to your own signal map and look back at the history later, so comparing rooms and times of day is quick. For Wi-Fi, the Wi-Fi Meter gives a live strength gauge for the same job.

Frequently asked questions

How long should I stay in each spot?

About 30 seconds is enough. Signal moves up and down all the time, so you want the typical range rather than a single reading.

Is the best signal always by a window?

Often, but not always. Some windows have metal-coated glass that blocks signal. Test a metre back from the window too.

Does the best spot change over time?

It can. Changes to nearby masts, new buildings or seasonal leaves on trees can shift things, so recheck if your signal suddenly gets worse.

Should I test with Wi-Fi turned off?

Yes, for mobile signal tests. With Wi-Fi off, your speed tests use the mobile network, so the results match the signal you are measuring.