I have found quite a few quad-band phones on eBay and elsewhere that have dual sim slots. None of them say that both sims can be used simultaneously, and I'm quite sure a lot of people buy them, assuming that they do. After asking a few of the sellers about this, with no replies, I assume that they would rather me buy it and find out, than to tell me no.

I have two phones, one of which is a work phone, and it must be on at all times. Therefore, I must have a phone where both sims work at the same time, or carry two phones, which I am tired of. The only phones I have found that have this capability are from Home || WND Telecom but they are not quad band. So my question is, does anyone know of a phone that works like this that does support all United States GSM frequencies? I travel all over the US, so I need one that works all over.

My friend told me about a dual sim iPhone but I've been trying to find out if both phone numbers (sims) will be active on the phone and that I won't need to switch between the two, could someone please clarify this for me