Samsung Galaxy s6 - The phone has a poor range, connects to LTE + and loses cove

Hello,
I have a problem with Samsung Galaxy S6 FLAT, when my mobile data is off, the phone connects to LTE + and has a very poor range.
If I turn on cellular data, LTE + appears and very weak range and after a while switches to LTE and is full range, but if I have switched off cellular data, the phone should maintain LTE + connection.
The phone is on the PLUS network.

Network in the StandBy state:

Network when I turn on cellular data:

How the network will switch to LTE:

There was no such thing before.
I am asking for help with solving this problem.

Switch permanently to 2G or 3G mode and check the range.

I've already done it, but it is cumbersome, and the internet is slow in this mode.
And besides, this phone has been working without a problem for a year and now something has broken.
And in general this is a phone in StandBy mode that should have a network, because I think that 2G or 3G? And not LTE +

In 2G mode it is 100% and in 3G also 100%.


Added after 9 [hours] 47 [minutes]:

Just today I noticed that in the AUTO network selection mode, the phone does not connect to a network lower than LTE, LTE coverage ends, the phone reports no range, I have to switch to 2G / 3G in settings and then the range is 100%.
Send a phone for a warranty. I even uploaded a new soft from the SmartSwitch level and it did not help.

PitiStewart wrote:

Send a phone for a warranty.

If the software update did not give anything, the service remains.

The fault did not arise after one of the order of software updates? If it is on warranty then it can be sent back. Or try to upload the latest software.

I think so after some update, the guarantees reject me because they say that it is ok. The software is up to date.

* # 1234 # check the software version and write us here. We'll think what to put in order to make it better But I will not give a 100 percent guarantee for improvement

Added after 2 [hours] 30 [minutes]:
The case looks like this at the moment:
After the loss of coverage, the phone changes networks to niches (UMTS).
And now, as I have switched off the cellular data and enter the settings -> Device information -> Status-> SIM card status and I write to it "LTE cellular network type" Should this be the case or should be switched to (UMTS). There is no LTE, 3G sign on the notification bar because the cellular data is turned off.

If someone has a SAMSUNGA GALAXY S6 (preferably with a PLUS card) then I would ask him to check if he has LTE in these SIM card parameters (Of course without mobile data enabled).

PitiStewart wrote:

How do I turn off the cellular data and enter the settings-> Device information-> Status-> SIM card status and I write to "Type of cellular network LTE" Is this the way it should be

Here he shows you what you have set and not what network is connected to.

You can easily upload, for example, without the XEO brand:

For Android 7.0:
07 May 2017 Poland (XEO) G920FXXU5EQD7
06 July 2017 Poland (XEO) G920FXXU5EQFC
28 July 2017 Poland (XEO) G920FXXS5EQG1

For Android 6.0.1:
07 February 2017 Poland (XEO) G920FXXU5DQA7
06 April 2017 Poland (XEO) G920FXXS5DQC1

I would start with the softa from May with Nougat. Maybe Pomerania. These three versions are older than yours on the Android 7 phone, and two versions on 6.0.1. It will not hurt to hurt or maybe it will help. This digit '' 5 '' in the middle of the version designation of the software is crucial for flash.

You do not need all of them in turn - try to upload the oldest Android 7, and the newest 6.0.1 if it does not help ...

So search: G920FXXU5EQD7
And then: G920FXXS5DQC1


For plus gsm, you generally have a smaller choice to look for:

For Android 7:
27 May 2017 Poland (PLUS) G920FXXU5EQCS

For Android 6.0.1:
20 February 2017 Poland (PLUS) G920FXXU5DQA7

Here the downgrade should go without a problem with Nugat on Marshmallow.


Before the soft - as well as after a hard reset from the keys .... soft you can find on updato.com

The phone is bought in media markt, the card I have only with a plus.

Added after 5 [minutes]:

leonov wrote:

PitiStewart wrote:

How do I turn off the cellular data and enter the settings-> Device information-> Status-> SIM card status and I write to "Type of cellular network LTE" Is this the way it should be

Here he shows you what you have set and not what network is connected to.

It's just that if I change to 3G or just fall into such a network, UMTS shows up there.
I only mean if the phone with no active cellular data should maintain the connection with LTE 2100 MHz (This is probably LTE +)

Stokłosy wrote:

You can easily upload, for example, without the XEO brand:

For Android 7.0:
07 May 2017 Poland (XEO) G920FXXU5EQD7
06 July 2017 Poland (XEO) G920FXXU5EQFC
28 July 2017 Poland (XEO) G920FXXS5EQG1

For Android 6.0.1:
07 February 2017 Poland (XEO) G920FXXU5DQA7
06 April 2017 Poland (XEO) G920FXXS5DQC1

I would start with the softa from May with Nougat. Maybe Pomerania. These three versions are older than yours on the Android 7 phone, and two versions on 6.0.1. It will not hurt to hurt or maybe it will help. This digit '' 5 '' in the middle of the version designation of the software is crucial for flash.

You do not need all of them - try to download the oldest Android 7, and the newest 6.0.1 if it does not help .......

So search: G920FXXU5EQD7
And then: G920FXXS5DQC1


For plus gsm, you generally have a smaller choice to look for:

For Android 7:
27 May 2017 Poland (PLUS) G920FXXU5EQCS

For Android 6.0.1:
20 February 2017 Poland (PLUS) G920FXXU5DQA7

Here the downgrade should go smoothly with Nugat on Marshmallow.


Before the soft - as well as after a hard reset from the keys .... soft you can find on updato.com

Just how does this downgrade do?

Odinem is rather the original rom you upload.

If someone has a SAMSUNGA GALAXY S6 (preferably with a PLUS card) then I would ask him to check if he has LTE in these SIM card parameters (Of course without mobile data enabled). Settings-> Device Information-> Status-> SIM Card Status, and this should be in the Mobile Network Type parameter

I need this information so that I know whether I should send a warranty, or if it is normal.

PROBLEM SOLVED _ It was enough to buy a new phone ...