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[Xperia X] "Prefer 4G" does not really prefer 4G

asked 2018-07-24 12:52:30 +0300

Giacomo Di Giacomo gravatar image

updated 2018-08-17 23:31:17 +0300

Since a few weeks I have been able to add 4G to my Vodafone plan. I have noticed that at some point the phone stops connecting to 4G altogether, but only switches between 2G and 3G, even if 4G signal is present and stronger than the other two. This happens after a while, typically hours. Switching plane mode on and off does not cure the issue, but a power cycle is required. I could suspect it's a network issue but if this were the case plane mode should solve it. I am currently on 2.2.0. When 4G works and I make a call, the phone falls back correctly to 2G/3G and restores 4G immediately after the end of the call.

Update 17 August 2018: It looks like that if the phone loses 4G connection due to poor signal it is never restored. I used my Xperia X as a hotspot in a place where there is a single place where I can barely get signal. Once reached 4G connection it could be held for hours, but if I moved the phone slightly the signal was lost and never recovered, switching instead to 2G or 3G. It also appears that a simple reset cannot fix the issue, or at least not always; a power cycle always works. Bottom line, this is not a usable condition. The year of free updates is expiring and we are left with a barely usable system with extremely serious problems in a basic function such as telephony.

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I have had a similar problem with the hallon operator (cheaper version of 3 in Sweden). It seems to happen where the signal is poor. Sometimes the rate is very good, although the 3G symbol shows. Sometimes it's very slow, and a reboot restores 4G.

khul ( 2018-07-24 22:49:07 +0300 )edit

I noticed the issue with my Jolla 1 as well, but it might be network related (o2 germany). However starting and ending a call (to mailbox for example) let the phone switch back to 4g in most cases.

till ( 2018-08-19 12:25:12 +0300 )edit

Toggling 'prefer 4G' to 2-3G then back to 4G usually brings 4G back. I don't have to reboot for this (I had due to SFOS getting confused with roaming, but that's another topic)

This embarassing trick works for my XperiaX (but only sporadically for jolla1, JollaC).

rtr2001 ( 2018-08-20 20:17:42 +0300 )edit

guys please give "4g only" setting......its annoying to play bitween network modes....

Lalit ( 2018-08-21 10:00:46 +0300 )edit

Anyway, the switch-back-and-forth trick does not work for me.

Giacomo Di Giacomo ( 2018-08-21 21:41:29 +0300 )edit

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answered 2019-04-28 00:15:49 +0300

Spark gravatar image

I also had the issue described by the OP after switching the network provider (to vodafone). In the end only a reflash to Android, usage of the 4G network in Android and reflash to Sailfish solved the issue for me. Now happily surfing in 4G immediately after activating networks. No loss of connection anymore.

Here's the description of the process.

This is by the way the second time I did this after I experienced the roaming issues last year. I am becoming a reflash-expert :)

Moreover I found a way to reflash Android on a Linux system without the need for the Sony Emma-Tool:

This procedure worked for my Xperia X f5121 as described there on Ubuntu/Mint. One little difference: the current java version to be installed is not openjdk-7-jre but openjdk-8-jre.

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Asked: 2018-07-24 12:52:30 +0300

Seen: 955 times

Last updated: Apr 28 '19