I have a strange problem here. When I have a call with SIM CARD1 then I’m able to send Whatsapp and/or access internet. If I have a call on SIM CARD2 then the internet connection is broken … I checked the APN settings on both SimCards/Providers are correct.
Anyone has also this problem or anyone knows how to solve this? In SIMCARD2 is my work number and sometimes phone calls are very boring …
It is possible that one of them can’t do voice over LTE which means the 4G connection drops to 3G when making a phone call. And if you are in an area with bad 3G signal this could mean that your internet connection drops.
There is only 1 sim that can have the data connection on a Fairphone 3.
So if you have set the data to sim 1, then sim 2 doesn’t get data.
If you want data on sim 2, then you have to switch the data from sim 1 to sim 2.
Hm … can you explain me this a bit deeper??
Why disconnects the FP3 my data connection which is always set to SIM1 when I use SIM2 for simple calls (not whatsapp or internet calls) This makes no sense to me …
ah ok … so if I call with SIM2 then SIM1 will be disconnected … but if I call via SIM1 then SIM2 will not be disconnected … so SIM1 hast a “higher priority” then SIM2 …
There is no higher priority - you just choose on which one you have data. If you use the same SIM for data and calls, everything continues to work. Using a different SIM for data and calls apparently disables data during the call on the FP3.
As far as my understanding goes, Dual SIM Dual Standby devices (such as the FP3) will drop the connection for a SIM when the other SIM is in an active call due to hardware limitations. There may be some cases where a 2G fall-back is possible, but I don’t know whether this applies to the FP3 (you’d need to have the call on a SIM that is set to use a 2G network and then test if the 3G/4G SIM maintains a data connection). Note that as the connection for the inactive SIM is normally dropped during calls, you will also be unable to receive calls on the idle SIM.
Simultaneous mobile data and calls on the same SIM should be possible with VoLTE, but not across two SIMs as far as I know.
As the phone has only one transceiver built in (DSDS specification )
→ DSDA two transceivers built in → two call/data connections simultaneously.
I wondered about this behavior too just some weeks ago and thought at first my phone was malfunctioning as I did not put any focus on this behavior up to then. When phoning I prefer to concentrate on my calling partner not necessarily doing other things with my phone.
But I found a simple work around if internet connectivity anyway was needed, using wifi if available should help here.
Generally spoken it is funny that even the chipset of FP2 is capable of being designed for a DSDA mobile.
The FP2 has a different limitation - using 2G only on one SIM. This means it can support dual SIM with a single LTE transceiver, which makes things much less complicated. I find it very plausible that it can do calling and data at the same time because the network standards of the two SIMs have to be different, also because I do not recall any similar complaints from FP2 users. DSDA phones with one SIM on 2G only, seem to have been pretty common some years ago.
VoLTE seems to be complicated to get right - the FP2 had the hardware (to do it on one SIM) but not the software support. I imagine dual VoLTE requires quite some programming & testing which Fairphone may not be able to do for a small minority.
You use the fp3?! So this phone is build with a “Snapdragon 632 Mobile Platform” with incloud the “Snapdragon X9 LTE Modem” this modem is build in a DSDS mode (nicht Deutschland sucht den Superstar) --Dual Sim Dual Stand-by–. So if u are in a phoncall on sim1 (incall or outcall) the sim2 is out of order for data and calls.
Fast workaround: change the data to the sim the phoncall is in the line.
Isn’t it rather made in a DSDV mode as stated in the original tech spec sheet as I pointed out some days ago?
Good to know anyway that you have found a workaround for you. I am curious if other Dual-Sim users here can get it done as well.
VoLTE as I know is not generally available/enabled by every carrier.
Can anyone else have a try on this? I think I’m not the only one curious about it.