> >At first I assumed they were locked to Sipgate, as nobody is selling them
> >at anywhere near the price that Sipgate do [cheapest I've seen is £109 on
> >eBay, no mention of VAT].

€99 on ebay Germany:
http://cgi.ebay.de/Dual-mode-Wi-Fi-G...QQcmdZViewItem


> >> From what I understand you configure the phone as you see fit?

Yes, as long as the firmware allows it. We have 3 of these at home -
all with different firmwares - all registered to a home PiaF Asterisk
system. Though not the Pirelli phone, they're T-Mobile TC300s, which
is basically a rebadged version. Used in conjunction with the TC300
Sinus base staion, the phones can be used to call, and receive calls,
via 3 different routes - 1 as an ordinary mobile (GSM), 2 through a
VOIP account (voipbuster/asterisk or whatever) and 3 through your
landline. Without the Sinus base station, it has just the 2 modes, GSM
and VOIP, though of course, used with a Fritzbox, Asterisk or
Speedtouch 780wl, or whatever kit has PSTN connectivity, you should be
able to dial out via your landline too...

> >Just go into the WLAN/SIP settings and if it lets you specify anything
> >other than sipgate.co.uk for domain name/proxy server/register server,
> >then it should work with services other than Sipgate. I am interested in
> >one and I use Sipgate, but I use it through Asterisk so if it was locked
> >it would be no use to me.

Don't know if the Sipgate one is locked or not. If it /is/ locked, you
could always change the firmware?

There are voipbuster setup instructions (in Spanish) here:
http://www.frikis.net/tc-300-voipbus...das-gratis/566