My n70 losses signal from time to time since I used the 3G for video calling. Sometimes the signal comes back but it wont stay for more than an hour. Then I also noticed that since then, it easily drains my battery. I have already tried putting back the old network mode from dual mode to GSM but the signal still fails. I even turned it off, but to no avail..
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Try to check your network signal if it's stable or dropping,also try to transfer your simcard to other phone and see if the problem is still the same.try check the settings of your network if you are using 3g or dual mode or only gsm mode,sometimes dual mode signal is not consistent by going to settings > phone > network and set it to gsm mode.
another way is formatting or resetting your phone,back up all necessary data first before proceeding,on your home screen type *#7370#, a lock code will be ask.enter the desire code or 12345 as the default code,then it will reboot automatically.Now try the signal if its ok.
If the above method doesn't work,might be a hardware problem and let a mobile service technician fix this problem,so you can find out what particular problem takes place.
The 3G icon appears only when you are in 3G reception area and you are receiving 3G signal. Ensure that you are in the 3G reception area and signal is received .some areas there may be weak signal it may also cause to select Gsm mode
How much are you using the phone for music, calls, browsing etc? Are you streaming from any websites?
Leaving wifi switched on or looking for access points will drain the battery. Have a good look through the phones settings. Also if you are in a weak 3G signal area this will drain the battery very fast as the phone is constantly switching between networks.
The thing to watch for 3G is if the icon keeps disappearing. This means it is switching back to standard GSM. Also if the signal is constantly low (one or two bars signal strength) and it says 3G this will also cause it to use more power.
Also check: Menu > Tools > Settings > Connection > Wireless Lan > Show WLAN availability - Never
It's worth checking the log too. Menu > Tools > Log, then press right. If you see a lot of WLAN entries listed at times when you weren't using WLAN let me know.
Another thing to check is if you are using a case make sure no buttons are constantly pushed in. Also make sure you close your camera's lens cover when not in use.
Other drains of power are screen savers with long time outs and listening to music for a few hours.
Some cases with strong magnetic clasps can cause problems as well.
Goto Wlan in Settings -> Options -> Advanced options
It will prompt you to that it's not recomended .. ignore it.
Change automatic config to manual.
The default tx power for the wifi chipset is a whopping 100mw! (For reference most cheap home wifi access points are about 25-50mw, and the lan card in your laptop is ~28mw)
Setting it to 10mw is going to be sufficent if your within 100 metres of your AP. Lower even if you have a strong Wifi network whever you use your phone's wlan function.
This buys me another couple of hours of standyby time a day (At most I can get maybe 10hours). with only GSM mode on.
you could also download nokia energy profiler
this reads your phones battery usage
best thing to do with it is install it close all applications while you sleep leave phone on and open nokia energy profiler
leave it running while you sleep
when you wake look at the graph it has made and see if there are power spikes ''surges'' or wether there is a nominal flat rating if your asleep and the screen saver is on stanby etc it should pretty much be a flat reading
if you have wifi connecting or another app doing something you will see a power surge...
For video call to work, you have to be in a 3G covered area. This means that the icon over your signal level bar must be full and have 3G written in it. It wont work if it is running on a low 3G band (the signal bars must be full) a GSM band (a G logo above the bars) or HSDPA band ( a H logo above the bars).
I don't know why even though HSDPA is faster than 3G but the viewty will only allow video call to take place when 3G is available.
I've heard it can also be dependant on your service provider, as PAYG sim cards sometimes wont allow video calls.
It sounds like you may have a poor 3G reception in your area. Even though other O2 phones are working better they may be running on the 2G masts in your area.
Try in setting/network menu turning off 3G reception, that way the device will only look for 2G masts. Your handset will give priority to 3G masts where available and sometimes will hold onto the weakest signal making poor call quality, and or dropping connection.
Advantages to using 2G only = better standby and talk time / better reception where 3G is poor.
Disadvantages = Slower web browsing / no video calls.
WEP / WPA will only apply if you are connecting using WI FI and have nothing to do with your mobile network connection.
Hope that helps?