Dual-SIM conversion kit for GSM phones

The Red Ferret's had a little experiment with a dual-SIM conversion kit for GSM phones -- pop it into one of the many compatible handsets and you can flip back and forth between two different carriers. I have a British and a US SIM that I switch between, depending on which continent I'm on, so this could be pretty handy.

The only thing I’ve noticed so far is that the offline mode doesn’t seem to be really offline with this thing in, because my battery now runs down a lot faster in offline mode than it used to. It’s no biggie, I’ll just switch the phone off or take out the twin SIM on flights, but it’s something to watch out for. It may just be a peculiarity of my setup, of course.

The other thing that’s not really clear from the site is the compatibility of handsets. The site has a long list of compatible handsets on it, which includes a lot of standard 3G and other phones, but even though the Nokia 6110 Navigator I upgraded wasn’t on the list, it still worked fine. So maybe it’s a matter of taking a gamble if your handset is not listed? Oh and remember you’ll need a phone with a back cover which bends enough, or has enough room to cope with the extra SIM.



  1. This would also be handy for people who have a separate SIM for their data plans. I have my voice plan with one operator, and my data plan with a different operator. The data SIM is currently in my mobile broadband modem, but I don’t always feel like lugging my laptop around with me. I’ve often wished I could have both SIMs in the same phone for voice and data. A few little modifications, and I can!

  2. I think – HOPE – that this means it’s just a matter of time before someone makes a dual-sim phone that doesn’t require switching, allowing you to receive calls on either of two numbers.

  3. This thing sucks. To me, dual SIM means that I can have two SIMs active at the same time. The “separate voice / data plans” example above makes clear why merely being able to switch is much inferior in comparison: It means that once you’re online, no one can call you. This is so 20th century. And just physically swapping out SIM cards isn’t that big a deal either.

    And of course there’s kits actually made for specific phones, which don’t require you to bend and possibly break your phone’s battery door. Oh, and they’ll actually give you dual SIM functionality, instead of the poor ersatz feature described above.

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