30-06-2023 04:21 PM - last edited 30-06-2023 04:22 PM
Basically when roaming starts the S21 tends to lose it's data connection. After a lot of testing this bug is now reproducible when on a roaming network:
1. Turn select network operator automatically off , then select e.g. your home operator.
2. In my test this was Vodafone, guess what 5G connected; bandwith superb.
3. Activate airplane mode for e.g 20 seconds
4. Deavtivate airplane mode
5. After about 60 seconds connection re-established on the Voda GSM network; no more data!
6. Ok no problem just do a manual scan networks operation, after about 90 seconds:" error searching for networks"
7. Game over no data ; internet access killed by a Samsung bug in the S21.
Hopefully the Samsung engineering team is allowed to look into this bug. I am sure there are still some S21 active S21 users around the globe. Would be nice if this major bug gets resolved.!!!
30-06-2023 05:59 PM in
Hi Pugs, tx for your reply. If it only was so simple. ...When following the steps to reproduce the problem: there is no change in any APN or other operator network setting. Therefore there must be a bug in the cellular modem firmware and or a bug in Samsung Android interface to the cell modem....
30-06-2023 06:42 PM in
30-06-2023 07:57 PM in
Maybe I should explain the bug in a better way:
1. Roaming on Vodafone 5g all ok
2. Activate air plane wait 20 sec deactivate ( stay in the exact same location)
3. BUG hits, reconnect to Vodafone ( same network ,still roaming). Now internet is dead,you only can do voice calls , no 5g , just old school GSM.
30-06-2023 08:40 PM in
30-06-2023 08:43 PM in
After even more testing I discovered a very weird BUG reproduction pattern:
1. All fine 5G roaming high speed
3. Internet / data roaming dead; voice ok
4. Reboot again
5. 5G is back .....
One can repeat the above sequence endlessly the BUG remains on and off; this is really odd behaviour and must be an interesting issue for Samsung to resolve?
30-06-2023 08:53 PM - last edited 30-06-2023 08:56 PM
After thinking about this really weird BUG pattern, I am suspecting the network search algorithm has bugs. The decision making between 5G and GSM 2G/edge, probably taking into account signal strengths is just no good. I noticed other posts in this forum describing similar issues.( Please note I have not ever experienced this bug on the home Vodafone network.)