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Originally Posted by motion
Used to carry 4 phones a few years ago... why can't I buy a multi-sim iPone??
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You can - in Asia. Very common there - any of the $50 Chandroids come with two SIM slots, pretty much.
Even the big phone makers sell dual-SIM phones for that market. There's just not enough of you demanding it in the US...
Or there are dual SIM kits where you cut down standard SIMs to nano or micro SIM size and use two. But there is additional funkiness around firmware/OS support.
But good luck doing that with a closed-ecosystem phone like the Apple...
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Grrrrr...... how hard can it be to have multiple numbers on one phone? Sheesh.
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It's very easy. The phone in front on me right now will answer or make calls on any of 5 phone #'s. 4 are SIP DID's, and the actual SIM # (which I regard as disposable & don't give out/use).
A DID is about $1 a month, most come with bundled minutes in that. Actual "pure" SIP (e.g. no DID, so no traversing POTS networks) calls are pretty much just data - e.g. WiFi/2G/3G/4G.
Any Android phone after about 3.x has a SIP dialer built-in - but even the most recent 4.x builds like KitKat don't include STUN support. So they won't work properly when NAT'd (call connects, but no audio, usually). Easiest solution is CSIPsimple, a free Android app which has STUN.
Oh yeh - and I can make/receive phone calls on free WiFi (e.g. airport) in another country before I pick up a local SIM too.
The other issues folks are referencing (spyware/remote wipe, mixing business/proprietary/sensitive information and/or email/calendars) are harder to solve. But just actual phone calls? That's been sorted for a long time...