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Originally Posted by tizmeinnit
The HTC One Dual sim does but its expensive. Dunno about the others but this one handles calls texts etc from both sims at the same time so no switching.
Is there a particular one you are looking at? and may I ask why does she want this capability?
---------- Post added at 12:42 ---------- Previous post was at 12:41 ----------
The HTC One dual sim uses both at once
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Cheers. She's considering a dual SIM phone as she will at some point need a business number and she doesn't want to be carrying around 2 phones all the time so this seemed like a good idea. I've been checking Amazon/Ebay for cheapish phones and read on one of them that the main SIM was 3G and the second 2G only with restricted usability therefore. I've all seen mention of this in several customer reviews but can't recall which specific phones it applied to right now. So, not being very tecchie, I was wondering if there was a particular problem in having 2 fully functional SIMs in the same phone at the same time and, if so, whether this might affect her decision. From what you've said it seems that it depends on the phone and probably the price thereof.
Think I've found the answer here:
http://en.wikipedia.org/wiki/Dual_SIM
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Mobile phones with built-in simultaneous dual SIM capability known as "Full Active (DSFA)" allow both SIMs to be active simultaneously and allow calls to be received on either number at any given time. All such phones have two transceivers built in, one of which may support 2G and 3G while another may only support 2G. This is for example the technology used in the older Samsung B7722 and Samsung B5722, or the newer HTC Desire 606w and HTC One 802w.
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It does appear some dual SIM phones have more SIM functionality than others. Something we'll need to check before any purchase.