Toggle Mobile

inquisitor · 12-11-2013, 01:46

It's interesting and new to me that phones are indeed cycling through all the IMSIs. Such trial-and-error method would mean the phone just tries to register with all the IMSIs and the HLR, which in such scenario has to know from which country each subscriber has an IMSI, then decides whether to allow registration or refuse it. It would also mean the registration process will take longer the more IMSIs you have. Is that the reason why toggle SIMs are limited to 9 IMSIs? Can you say for how long your Android phone sticks to each IMSI?

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inquisitor (Offline) Senior Member Prepaid Professionist Posts: 1,399 Join Date: 15 Nov 2006 Country:	12-11-2013, 01:46 It's interesting and new to me that phones are indeed cycling through all the IMSIs. Such trial-and-error method would mean the phone just tries to register with all the IMSIs and the HLR, which in such scenario has to know from which country each subscriber has an IMSI, then decides whether to allow registration or refuse it. It would also mean the registration process will take longer the more IMSIs you have. Is that the reason why toggle SIMs are limited to 9 IMSIs? Can you say for how long your Android phone sticks to each IMSI? 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