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Elephone P8(2017): massive problems with GSM800

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Post time 2018-1-3 22:25:21 | Show all posts |Read mode
As some of you may remember, I had problems with my first P8 and SIM-Services, where Elephone-Support came to the conclusion that the phone must have an hardware-defect. So I ordered a second P8 in moccha-gold. So far I was rather happy with it, although the 21MP-Sony-Camera does not meet the expectations I had after the great M3 with the same sensor.

A few weeks ago I  ran into a situation where I desperately needed the phone-function, which I usually never use:
I had a car-accident and hat to call the car-service and wait for recalls of them.

That's when I realized that my 'new' P8 has massive problems with the telephone-function - at least with my (only) SIM-card.
Here in germany one has the choice between GSM800 and GSM1800, and I have my card from a provider that uses GSM800.
The SIM-card is new, by the way - I replaced it when the problems with my first P8 occured.

Phenomenon:
The P8 randomly loses and establishes connection to the GSM-network.
When it loses the connection, it might show 'not connected' or it might display a correct connection.
In either case the phone is being disconnected from the GSM-network, it neither receives calls or SMS not can it make calls or send SMS.

The faulty behaviour has no recognizable reason or pattern. The phone can be placed immobile at perfect signal-location, be turned on permanently and lose the connection, and find it again.
But the phenomenon occurs more often when the display is switched off or when the phone is being moved through locations with bad or nor GSM-signal.

When the phenomenon occurs, it SOMETIMES helps to reboot the phone, but often it helps not.
When the phenomenon occurs, it ALWAYS helps to reset the network-settings, which of course deletes all WiFi-data too.

I tried the SIM-card in both slots, with identical results.
I tried the SIM-card of my wife (same provider, GSM800) with identical results, so I can exclude a SIM-card-defect.

I finally gave in and bought a GSM1800-SIM-card.

And guess what:
The GSM1800-card never loses connection
The GDM800-card still randomly loses connection as before, i.e. even when the phone is in perfect signal-reception-lacation and not being moved.


Conclusion:
The P8 seems to have a severe problem with the Modem-Chip and GSM800. Or an abysmal software-implementation.
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Post time 2018-1-4 18:46:36 | Show all posts
You should try to reinstall the ROM.
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Post time 2018-1-8 04:47:03 | Show all posts
Hello. Which firmware currently installed on your phone?
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 Author| Post time 2018-1-8 19:30:45 | Show all posts
During testing I have gone through dozens ROMs. I am using the latest official 20171009 and automatic updates are activated.  

Maybe I will go through the hassle again and try other versions, but since I have about 20 official ROM-Versions for the P8, I would like a reasonable hint where to start.
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Post time 2018-1-10 22:37:26 | Show all posts
Deepflex replied at 2018-1-7 08:47 PM
Hello. Which firmware currently installed on your phone?

Do you know if this issue is fixed in any of the firmwares?
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 Author| Post time 2018-1-22 20:52:52 | Show all posts
I have tried the first available official ROM now for some days (from April), then tried one of the early release-versions from June and updated to August today.

All ROMs behave the same.

The modem seems to enter some kind of energy-saving (which it really should never do in a phone!) and not to get up again.
This is independet from the SIM-card or the provider.
It occurs more frequently with GSM800, but also occurs with GSM1800.
There's no reliable way to get the connection up again, except resetting the network-settings.

After a full format and fresh installation it SEEMS to work ok for a while, but sooner or later it starts behaving oddly.
I have finally contacted the support about it, after having tried everything I can imagine.


The most trobling thing is that BOTH my P8 have modem-problems, and both seemed to function in the beginning. Both were produced MONTHS apart and are surely not from the same production-badge.

Which either makes me an incredibly unlucky guy - or the P8 a seriously bugged device.
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 Author| Post time 2018-1-29 20:56:55 | Show all posts
After observing the behaviour for some more time and trying more ROMs, I finally contacted the support.

They guess that it must be some contact-problem, with the antenny-contacts or the HF-cabling from top to bottom. Like the concluded with my first P8.

I checked all this, with the same result as with my first P8: none. Everyhing is looking perfect. No miracle, considering the fact that I never dropped the phone so far...

The phenomenon is not related to movement anyway.

As long as the P8 is "active", it keeps the connection. I activated the "keep alive"-feature in developer-options, so the phone can stay awayke for infinite time when connected to power. This usually means that it's completely immobile, too.

When I let the phone enter the energy-saving, it's very likely that it gets disconnected from GSM, and that it stays disconnected for quite some time when it's waken up.

I stick to my idea that the modem is being set to some energy-saving-mode (which the modem NEVER should do) and fails to be started again.
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