[Community] dual-sim modems?

mx4812 at arcor.de mx4812 at arcor.de
Wed Feb 26 16:43:58 CET 2014

thanks for the reply and current status!

----- Original Nachricht ----
Von:     "Dr. H. Nikolaus Schaller" <hns at goldelico.com>
An:      OpenPhoenux Community <community at openphoenux.org>
Datum:   26.02.2014 15:54
Betreff: Re: [Community] dual-sim modems?

> Am 26.02.2014 um 15:32 schrieb Ryan de Laplante (personal):
> > I've always thought dual-sim would be useful to combine work and
> > personal phones into one.
> Yes, I agree.
> What potential developers of such dual-sim devices have to consider:
> a) there must be room to store a second SIM tray (this influences the case
> design)
> b) the modem must be capable to autonomously control and switch between two
> SIMs to read their IMEI etc. *and* register on two different networks.
> In the Neo900 and GTA04 designs we have no space for a) and the modems used
> don't have b) in their firmware [as far as we know - and before someone
> suggests to ask the suppliers: we have already done but did not get an
> answer on this topic].

Concerning a) there seem to exist "dual-sim adapter"s offered that either have a wire connected to a 
second sim envelope placed loosely beside the battery, or cram two cut out SIM chips into one SIM tray.

Concerning b) as those adapters don't seem to be very expensive, maybe someone who has a GTA04
or relevant Option modem cares to try out? For example, simquadrat offers prepaid SIMs with that are
directly reachable under a "land line" number in germany or poland.

The Adapter may only allow to have one card registered at the same time, but maybe it allows to
switch to the second SIM to place outgoing calls (using a flat rate SIM).

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