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Forum Thread

How Do RSIMs Work?

2,025 266 August 23, 2021 at 04:27 PM
From what I can gather with RSIM:
  • It only works with iPhones
  • Newer versions accommodate latest iPhones
  • Unlock works until phone is updated to latest iOS

Then, we follow these steps:
  1. We buy the RSIM from the eBayz
  2. Get the iPhone on Wifi
  3. Insert the SIM card with the RSIM together
  4. Select correct option
  5. Enter some 20-digit code
  6. After unlock, latest RSIM allows for SIM-only in the slot
  7. Update iOS or factory reset? Re-do RSIM steps

Are my words correct thus far?
Do we need to re-do RSIM after a reboot of phone?
It does not permanently unlock phone, yeah?
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TrevorK
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> bubble2 51,186 Posts
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dzap
08-29-2021 at 10:14 AM.
08-29-2021 at 10:14 AM.
The 20-digit code is an ICCID number. This is the number typically associated with your sim card. The long story short is that Apple has an internal list of ICCID numbers that are recognized to make sure the iPhone stays unlocked, for testing or development purposes for the carrier, as they aren't physically sending someone going to every country in the world testing a new iPhone on every network in the world; too expensive, too time consuming.

Anyway all R-SIM is doing is spoofing that number, from your sim card, so that Apple's servers recognize the ICCID as a development/testing/etc ICCID number and allow the device to be used with that SIM. When the ICCID numbers leak or change, then your phone becomes "locked" again if the ICCID is blacklisted by Apple. Your phone was never officially unlocked, it was just telling Apple that "I'm a testing/development sim, so don't lock me out with this sim."



Quote from TrevorK :
Are my words correct thus far?
More or less.
Quote from TrevorK :
Do we need to re-do RSIM after a reboot of phone?
You shouldn't have to, no. As far as I know, Apple isn't checking the ICCID upon every reboot; there might be some kind of internal polling timer that it may check it after XXX amount of days or something, but that can change with an iOS update. If you remove or change the SIM, then yeah the ICCID will be re-checked.
Quote from TrevorK :
It does not permanently unlock phone, yeah?
No.
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Joined Jan 2010
L7: Teacher
> bubble2 2,025 Posts
266 Reputation
Original Poster
TrevorK
08-29-2021 at 01:49 PM.
08-29-2021 at 01:49 PM.
Quote from dzap :
The 20-digit code is an ICCID number. This is the number typically associated with your sim card. The long story short is that Apple has an internal list of ICCID numbers that are recognized to make sure the iPhone stays unlocked, for testing or development purposes for the carrier, as they aren't physically sending someone going to every country in the world testing a new iPhone on every network in the world; too expensive, too time consuming.

Anyway all R-SIM is doing is spoofing that number, from your sim card, so that Apple's servers recognize the ICCID as a development/testing/etc ICCID number and allow the device to be used with that SIM. When the ICCID numbers leak or change, then your phone becomes "locked" again if the ICCID is blacklisted by Apple. Your phone was never officially unlocked, it was just telling Apple that "I'm a testing/development sim, so don't lock me out with this sim."




More or less.
You shouldn't have to, no. As far as I know, Apple isn't checking the ICCID upon every reboot; there might be some kind of internal polling timer that it may check it after XXX amount of days or something, but that can change with an iOS update. If you remove or change the SIM, then yeah the ICCID will be re-checked.[/FONT]
No.

Thank you for the most-excellent, detailed response. Smilie
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