[8525, TyTN, MDA Vario II, JasJam Accessories] pinkopalino:
My working dual sim solution

I would like to give back some to this awesomely helpful community instead of just lurking, so...

Here: http://www.hot-wire-telekom.de/index.php?aktion=detail&suche=HTC TyTN&asuche=HW130010

I have found my working solution.

Although in German, they feature a kind of questionnaire to find the right dual sim product suitable for the phones.

The TyTn with UMTS Card should be equipped with an analogue dual sim adapter, for they have found the digital ones (with the menu item for swithching appearing on the phone) will not work. They also drain the battery like hell. :-(

So far as to my choice of adapter.

Now to the cutting part:

One can either buy or rent the cutting tool - or find a shop having one for that matter, but the most damage to cards while cutting happens through electric discharges. So properly ground yourself before fiddling with the card.

The cutting itself is maybe something you would like to practice once on an really old sim you might have.

I myself was hesitant at first, to cut into the "gold" area of the card, but if you have applied the transparent sticker properly, there is really not much to be afraid of, since only the six connectors are needed which also now make contact with your phone. (sometimes you can tell by seeing the slide-marks on them)

The sticker comes in handy, because once you have chipped away enough plastic, you could otherwise only guess which corner needs to be cut. Test the sims funcionality immediately after cutting via the supplied resume cards, to rule out any malfunction here, because you'll have to do enough fiddling afterwards. ;-)

The annoying part is truely not the cutting, but getting the device to recognise both sims.

One piece of advice though: Be careful with the sliding cover, while putting it back on. On the first try, i cut through the platina of the adapter, having to order a new one afterwards.

Once you have the sims in the device, place the adapter in the phone and do use the supplied cushioning about a millimeter away from the visible chip on the adapter towards the other end of the adapter. Place it across, not alongside the adapter.

Others have experimented with layers of scotch tape to adjust the pressure, but I have had no success with that. Just try it. You might also want to fixate the backs of the sims insade the adapter with one strip of scotch tape.

Be careful though, not to push out the bottom from the casing. The glue used cannot take that much pressure.

One thing I had to adjust in addition was the "cradle" of the sim card.

On the back end towards the outside of the phone's case, you'll notice a small rectangular space, normally covered beneath the sim.

Since all of these operations boil down to the fact, that proper connection of the sims, dual sim adapter and phone have to be established, I figured it might help to place some folded paper in there - just enough to fill the gap from unterneaththe slid-in adapter but not yet blocking its path.

Then while carefully sliding in the adapter, try to place the back edge of the adapter just ever so slightly between the TyTn's case and the paper, which should disappear completely underneath the adapter.

After hours of testing with one adapter ruined, this is how I have got it to work - mechanically.

The switch between cards is done by entering and exiting flight mode, which works most of the time.

I have figured out a procedure that tells me which sim is in use at the moment, by looking into the program folder. The sim toolkit applications which automatically load when the phone activates show up and disappear there and allow me to tell the sims apart.

This has become necessary, because the phone shows the operator name of the first activated sim during initial phone startup, instead of changing. Especially since I have a BASE and an E-Plus account which are networkwise

basically the same, this procedure allows m to tell them apart. I have tried diffeent apps for this, but none have given good results and this aproach is quite simple.

There also is a registry hack availeable which I'll just quote here, since I forgot where I cut and pasted it from:

Customize operator's name

To show specified operator name set

HKLM\SOFTWARE\OEM\PhoneSetting\ONSDisplayRule=0 (DWORD decimal)

And then at

HKLM\SOFTWARE\Microsoft\RIL\Operator Names

add the code and the name to display. The value is 5 digits "CCCOO", where CCC is 3-digits country code, and OO is 2-digits operator's code. For example:

"25099"="BEE LINE"

For country and network code, go to wikipidea for mobile country code and network code

To show operator name based on the SIM card used (eg for cases where dual SIM adapter are used), set

HKLM\SOFTWARE\OEM\PhoneSetting\ONSDisplayRule=1 (DWORD decimal)

For my dual-SIM adaptor, when I switch between SIMs, the phone with default settings showed always one and the same name, until I reboot the device. Then, it was not able to retrieve operator's name from one of the SIM cards I use. Probably it is an adaptor fault. But anyway, after I changed ONSDisplayRule to 0 and set more up-to-date names for operators that I use, I now always see the name of the operator of the chosen SIM.

End of quote.

These are basically my findings. I hope this is of any help to somebody here.

Cheers, Chris