Samsung Galaxy J3 (2016): Inconsistent Connection and Poor Coverage - Possible Fixes?

Hello.

The question may be secular but for me the phone is not a toy but a device for conducting conversations and I often do not know what is on its menu.
But to the point. In December I got a new phone call. From the very beginning there are problems with the range and disconnection of connections. In places where for years I have talked in the same network without any problems, now almost every time I stop talking, it ceases to be heard for a dozen or so dozen or so seconds. How I am outside is much better. Maybe something is wrong with the phone maybe something is wrong? Therefore, I have a question: I enter the menu and in the "cell phone network". There I have 4 positions to choose from:
- 2G / 3G / LTE (Auto)
- 3G / 2G (Auto)
- Only 3G
- Only 2G
After setting the 2G / 3G / LTE range I have no line at all. (Big City of Lublin) Internet does not work at all - when I try to enter Net I have the message "you are of line" (sometimes it works but once on a Russian year) you can not send an MMS. Sending goes on forever. When I'm outside, sometimes I have one line.
After switching to other options, the range is almost maximal and the least breaks at 2G but then the internet does not work and I will not send MMS you need to switch to 3G or 2G / 3G (Auto) then you can send MMS and the internet works, but the call breaks the call permanently . I have to walk around the room and look for "reach." Hassle.
Maybe someone from colleagues who know the subject can suggest something (something else to set?). In my opinion, a phone call for a lot .... but maybe I'm wrong.
A few days ago for the test card, I transferred the Samsung Galaxy mini2 to Samsung and no problems, no interruption, it works like a dream in the same places.
The software is most up-to-date. Android 5.1.1
Return to warranty repair? But as I say it will come back after a few weeks with the annotation "fully functional"

You can give it for a warranty repair is always worth a try. You can check your phone on another sim card.

Unfortunately, such an J3 condition that sometimes interrupts - with you often. You can try to upload soft from February. It should be much better. However, in the first place, if the tel is under warranty yet, you should advertise it. It's different with these guarantees and it would be a shame that they would not take into account you.

Hello.

So how do I understand this symptom of almost complete absence of signal on the 2G / 3G / LTE setting is an abnormal symptom? Because this is my only point of reference in the case of complaints. In other options they can turn on and say that the signal is ok and the phone is working, ......
I did tests in the city and outside the city. The signal is missing in both cases.

Install GsamBattery for a while https://play.google.com/store/apps/details?id=com.gsamlabs.bbm&hl=en It will show the changes and quality of the GSM signal. The signal should be caught in all ranges - maybe in addition to LTE - so advertise peacefully. You are entitled to the normal use of tel. GsamBattery can be taken into account during the complaint.

Hello.
Thank you very much. I will advertise.

Hello.
The phone is working well. I called the network and talked to a consultant. He said he would send me a configuration program and I would install it. I silently laughed at him because I did not believe that it would help. Then he told me to turn off the phone and turn it on. After this operation the situation is as follows. The signal on the set option 2G / 3G / LTE (Auto) is half scale when it displays LTE to me as it switches to 3G, that is max. (previously it was zero) and I have been talking comfortably for a few days. In all places where it was practically impossible to talk half a minute now is absolutely without reservation. MMSs are sent instantly, it takes half a second (previously it did not send at all). The Internet works perfectly in the 2G / 3G / LTE option (previously it had to be manually switched to 3G).

Thank you for your interest.