I bought the Samsung Galaxy J5 Prime Duos (SM-G570M) in August and upgraded to Android 7. Now another phone which is exactly the same model is asking for a software update to Android 9 Oreo but my one isn't and despite my prompts trying to download updates manually there is no option to upgrade.
The main issue though is that I have used one SIM for calls (SIM 1) and another for mobile data (SIM 2 - i.e. browsing only). Both SIMs have different network providers. Despite trying all sorts of different network connections and combinations on each SIM, I just didn't feel that something was working properly i.e. in one part of the flat I would lose mobile data connection on one SIM while the SIM with calls would be fine and vice versa. I was thinking of just having one SIM with both calls and data and am wondering if this would improve things?
At the moment I have moved the calls only SIM to an old Samsung Galaxy Y (with 3G activated) which was my first android phone in 2011. Now there appears to be an improvement in the J5 Prime in operational speed of using the phone and up to a point connection strength for the other data SIM which is now in SIM 1, with SIM 2 empty.
I am trying some tests through speedtest.net and checking out different providers. I don't know how accurate this is. It's not just the speed but the signal strength that's important.
So to summarise my questions:
(a) Why no update for Android 9 on my J5 Prime?
(b) Is it better to have two separate phones and can dual SIM weaken signal strength and download/upload performance in SIM 2 (which I used for data)? If not can any settings improve this?
My understanding is that you can have either:
2G (GSM only) for calls (SIM 1) and 3G (WCDMA only or GSM/WCDMA) for data (SIM 2)
or
3G (WCDMA only or GSM/WCDMA) for calls (SIM 1) and 4G (GSM/WCDMA/LTE) for data (SIM 2)
but not
3G (WCDMA only or GSM/WCDMA) for calls (SIM 1) and 3G (WCDMA only or GSM/WCDMA) for data (SIM 2) which is actually what I am after.
...unless I am wrong and SIM 2 is always condemned to 2G whatever I do...
(c) Is it worth just having one SIM for calls and data using only one provider (obviously the strongest one in this case) or even two SIMs from the same provider: one for calls and the other for data? Or are two separate phones a better option?
(c) Can I reliably check connection strength and upload/download strength using speedtest.net and different servers (i.e. different providers) using the same SIM card from one provider?
The main issue though is that I have used one SIM for calls (SIM 1) and another for mobile data (SIM 2 - i.e. browsing only). Both SIMs have different network providers. Despite trying all sorts of different network connections and combinations on each SIM, I just didn't feel that something was working properly i.e. in one part of the flat I would lose mobile data connection on one SIM while the SIM with calls would be fine and vice versa. I was thinking of just having one SIM with both calls and data and am wondering if this would improve things?
At the moment I have moved the calls only SIM to an old Samsung Galaxy Y (with 3G activated) which was my first android phone in 2011. Now there appears to be an improvement in the J5 Prime in operational speed of using the phone and up to a point connection strength for the other data SIM which is now in SIM 1, with SIM 2 empty.
I am trying some tests through speedtest.net and checking out different providers. I don't know how accurate this is. It's not just the speed but the signal strength that's important.
So to summarise my questions:
(a) Why no update for Android 9 on my J5 Prime?
(b) Is it better to have two separate phones and can dual SIM weaken signal strength and download/upload performance in SIM 2 (which I used for data)? If not can any settings improve this?
My understanding is that you can have either:
2G (GSM only) for calls (SIM 1) and 3G (WCDMA only or GSM/WCDMA) for data (SIM 2)
or
3G (WCDMA only or GSM/WCDMA) for calls (SIM 1) and 4G (GSM/WCDMA/LTE) for data (SIM 2)
but not
3G (WCDMA only or GSM/WCDMA) for calls (SIM 1) and 3G (WCDMA only or GSM/WCDMA) for data (SIM 2) which is actually what I am after.
...unless I am wrong and SIM 2 is always condemned to 2G whatever I do...
(c) Is it worth just having one SIM for calls and data using only one provider (obviously the strongest one in this case) or even two SIMs from the same provider: one for calls and the other for data? Or are two separate phones a better option?
(c) Can I reliably check connection strength and upload/download strength using speedtest.net and different servers (i.e. different providers) using the same SIM card from one provider?
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