It’s been more than a year since users asked for a fix for this issue: The cellular data issue on dual-SIM Windows 10 phones is not region or country specific, as one would first imagine, nor does it have anything to do with carrier or signal coverage as another user confirms: When Dual Sims activated: (First SIM card 3G and second SIM card no internet access) I opened two websites. The first one did not allowed me to login AT ALL ( I tried three times and cannot login) and the speed was turned to slow. The second website allowed me to login but the speed was slow. When I turn off dual Sims and use only the first SIM (I use only 3G depends on the signal) Both websites opened fast and I was able to login to both of them without any problem. There is a problem when dual SIM is activated (dual stand by), however I cannot tell if this is a software or hardware problem. Let us hope that a fix will be available when the next Windows 10 Mobile build is launched. Otherwise, this issue will become another annoying problem Microsoft took too long to solve. First sim is TIM with 3g activated (2100Mhz), and the second sim il LycaMobile (Vodafone) with no data active, but it’s 2100Mhz too. With this configuration i have same problems with speed and responsive application. It is interesting to notice how Microsoft downplayed the issue, stating that Insiders reported it with the last two Mobile builds. Actually, users started complaining about this problem back in 2015. RELATED STORIES YOU NEED TO CHECK OUT:
DataSense Feature in Windows 10 Manages Data Usage on WiFi and Cellular Annoying 0x80070002 error gets fixed in Mobile Build 14342 Fix: Windows 10 Mobile phone stuck at Windows logo screen Windows 10 Mobile to get new Settings app icons
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