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04-12-2009, 10:21
Truphone and Jajah are pure VoIP-serivces, which have nothing to do with GSM or mobile telephony and so won't provide a SIM card, allthough you may use these services from a handset.
However even those providers offering GSM services through a SIM card don't necessarily use conventional PSTN-technology. Especially for roaming a lot of international routing is performed over IP due to cost savings and so sometimes even circuit-switched GSM-technology may suffer from the weaknesses of the packet-switched Internet Protocol.
terminals: Samsung: Galaxy S5 DuoS (G900FD); BLU: Win HD LTE; Nokia: 1200; Asus: Fonepad 7 ME372CG; Huawei data: E3372, Vodafone R201, K3765, E1762;
postpaid: O2 on Business XL; prepaid: DE: Aldi Talk, Lidl; UK: 3; BG: MTel, vivacom; RU: MTS; RS: MTS; UAE: du Tourist SIM; INT'L: toggle mobile
VoIP: sipgate.de (German DID); sipgate.co.uk (British DID); ukddi.com (British DID); sipcall.ch (Swiss DID); megafon.bg (Bulgarian DID); InterVoip.com
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