xperia E dual internet slow problem

[goodnormal]

Dear All,

when I use both sim cards ,one for call and one for data, internet speed becomes low.

So I should disable call sim card to use internet with data sim card with proper speed.

Is it a  software problem or signal interfere issue?

Thanks

[goodnormal]

Is there any idea about sim cards interfere?

[ssd]

I am  single sim user ....n i have heard that Dual sime xperia E has many problems..with connection.. i think disabling other sim while surfing is only answer

[goodnormal]

I have update sony xperia E dual to 4.1  but it has still slow internet problem when both sim are active( one for call and one for data).