LUMIA 640 XL LTE (LUMIA DENIM): Dual SIM functionality isn't working well

simvirdi

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Dec 12, 2015
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I use SIM in both the slots, I use mobile data from 1st SIM and calls from both SIM 1 and SIM 2.
The problem is that when I take a call on the 2nd SIM, after disconnecting the call, many times, 1st SIM doesn't work. This means I am not able to receive calls or use mobile data on SIM 1 once it happens, even for hours. The way to restore its functionality is to reboot the phone or manually turn SIM 1 off and on from settings.
The notification bar at the top still shows symbol 'H' for 3G but it actually doesn't work, which also means that you can't know that the network is not working unless you try to make a call or browse something online.
Also, this never happened the other way around, after disconnecting call from SIM 1, SIM 2 is instantly up for use.

Any fix around this?
 

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