UMI Z - Bad 4G / 3G connection

kirikou

Hello,

just to say that i have a very bad 3g/4G connection with this new phone. No problème with my honor 7 in the same place.
What can i do to solve this problem.
I am in France .
the spefication in your website :

GSM: 850(B5)/900(B8)/1800(B3)/1900(B2)
WCDMA: 850(B5)/900(B8)/1900(B2)/2100(B1)
LTE FDD: 2100(B1)/1800(B3)/2600(B7)/800(B20)


The band caracteristic are Ok for france but i don't have a good reception.


Do i have to unlock something because in MTk engeneer i don't find all of this band ( WDCMA 2100 for exemple ).

Regards

axel2012

Hello, I also have the problem that the reception is always gone. It always goes from 4G to e. If I leave the UMI Z on the table remains the reception on 4G. If I take the UMI Z in the hand the receipt goes away. I then took a silicone case from another cell phone. This solves the problem. Unfortunately one gets no help from anyone, not from Gearbest and not from Umidigi.
Umidigi does not even answer.

Greeting Axel

Whisper40

\n\nHello, I'm a french customer too !
I will try what  you say because i have the same problem !"EDIT : Same problem...."

The connection On 3G/4G is very very SAD ! we are disconnected all time from the network !

Another problem on the picture quality..... it's horrible... 13mpx for that ! omg

(PS :How to root this phone ? )

Thordelan

This is weird because I'm French too and I feel exactly the same. I feel like the that the 3G/4G signal pretty often falls to zero for no apparent reason, just because I moved by 1 meter, and or took the phone in my hand, or whatever.

So I wouldn't say the reception is bad, but I feel like the signal often cuts off very suddenly.

My sayings are based mostly on the visual of the signal icon at the upper right of the phone that I see dropping to "zero" more than on my day to day experience for now.

kirikou

I try this

A solution taken from another post, you could try changing your band mode by entering *#*#4636#*#*  in the dialer > phone information > press top right three dots > select radio band

I chosed EURO and it's very better.

kirikou

Same observation. When I unlock my phone the symbol 4G is present with a good reception and 2 seconds later I no longer have the symbol and I go back in 3G with a very bad reception.

Thordelan

Merci beacoup !

Can't say yet if it's better or not since I'm at work and I can't test it but at least I googled about it and learnt a few interesting things

A savoir que si en France on utilise que le 900 et le 2100, il est inutile de garder les bandes 800,850 et 1900 comme sur la photo ci dessus (a moins que vous voyagiez souvent à l'étranger). Et ce pour 2 bonnes raisons. La 1ère est que vous consommerez moins de Batterie, la seconde est que, de temps en temps, les bandes se marchent un peu sur les pieds. Effectivement, vu que nos chinoiseries sont conçues, pour une majorité, pour un marché local Chinois, ceux ci ont du mal à tester en situation réelle le fonctionnement de ces bandes qui leurs sont étrangères.
Les chinois utilisent la 3G 2100Mhz par exemple, vous pouvez être certains qu'en France elle fonctionnera parfaitement.
En revanche, pour la 3G 900Mhz c'est une autre histoire. Les Chinois (qui utilisent quant à eux le 850Mhz), bien souvent la développeront en "théorie", ce qui fait qu'ici dans la pratique on peut avoir quelques surprises. Ce n'est pas le cas de tous les fabricants bien entendu, mais cela arrive assez fréquemment pour que cela soit souligné.

Medard22

Guys I would mark this thread as sticky. Those are very helpful informations indeed

Thordelan

Actually, I used the EngineerMode code :

1. *#*#3646633#*#*

Copy the Code

Then Telephony -> BandMode -> SIM1

And I only kept bands used in France

1. EGSM900 (2G)
   
2. DSC18000 (2G)
   
3. 
   
4. WCDMA-IMT-2000 (3G)
   
5. WCDMA-GSM-900 (3G) (don't need this one if you life in the city areas)
   
6. 
   
7. Band 3 (4G)
   
8. Band 7 (4G)
   
9. Band 20 (4G)

Copy the Code

kirikou

After a day I can not say I am satisfied. My honor was better under the same conditions. As soon as I turn on my phone I have the 4G logo but after a few seconds 3G without reception. And when I play with the bands it comes back. Very strange .... waiting for umi answer

Thordelan

Exaclty the same for me, the 3G/4G acts very strange and my Oneplus One had no problem.

Also yesterday I got disconnected 2 times in 5 mins during my phonecall, in a place I never had a problem before.

Guster

I live in Portugal and its fine the 4G connection