Sponsored Links

A SIM is a full blown computer

Lucian

ULTIMATE Member
Ok, this is both surprising and eye-opening, I always thought a SIM is just read-only memory.


"A SIM card is a full blown computer with its own CPU and memory.
Your carrier can upload and run arbitrary code without your consent or knowledge. They can do this at any time.
This means that your "phone" is actually three different computers running in concert - the actual phone itself (iOS or Android or Symbian), the baseband processor running the baseband code, and the SIM card.
"

Example hardware from the same link:
"Atmel AT90SC25672RU, 8-bit AVR, 256KB ROM, 72 KB EEPROM, 6 KB RAM, Between 20 & 30 MHz"
 
Ok, this is both surprising and eye-opening, I always thought a SIM is just read-only memory.
I didn't realise the extent of what they can do through a SIM but I did know that they weren't read only as you used to be able to store contacts on them back in the days of Nokia - I am to believe you can still write contacts to a sim now.
 
Yes you can still import and export your contacts to your sim Bubbles.
I find it easier just to store them in the cloud.

Won't be too happy if someone deletes the cloud one day though. ☺️
 
Sponsored Links
Yes you can still import and export your contacts to your sim Bubbles.
I find it easier just to store them in the cloud.

Won't be too happy if someone deletes the cloud one day though. ☺️
I have them stored in two Google accounts, my mi account and as a backup, my SIM!!!!
 
Top
Cheap BIG ISPs for 100Mbps+
Community Fibre UK ISP Logo
150Mbps
Gift: None
Virgin Media UK ISP Logo
Virgin Media £22.99
132Mbps
Gift: None
Vodafone UK ISP Logo
Vodafone £24.00 - 26.00
150Mbps
Gift: None
NOW UK ISP Logo
NOW £24.00
100Mbps
Gift: None
Plusnet UK ISP Logo
Plusnet £25.99
145Mbps
Gift: £50 Reward Card
Large Availability | View All
Cheapest ISPs for 100Mbps+
Gigaclear UK ISP Logo
Gigaclear £17.00
200Mbps
Gift: None
Community Fibre UK ISP Logo
150Mbps
Gift: None
Virgin Media UK ISP Logo
Virgin Media £22.99
132Mbps
Gift: None
Hey! Broadband UK ISP Logo
150Mbps
Gift: None
Youfibre UK ISP Logo
Youfibre £23.99
150Mbps
Gift: None
Large Availability | View All
Sponsored Links
The Top 15 Category Tags
  1. FTTP (6026)
  2. BT (3639)
  3. Politics (2721)
  4. Business (2439)
  5. Openreach (2405)
  6. Building Digital UK (2330)
  7. Mobile Broadband (2146)
  8. FTTC (2083)
  9. Statistics (1901)
  10. 4G (1816)
  11. Virgin Media (1764)
  12. Ofcom Regulation (1582)
  13. Fibre Optic (1467)
  14. Wireless Internet (1462)
  15. 5G (1407)
Sponsored

Copyright © 1999 to Present - ISPreview.co.uk - All Rights Reserved - Terms  ,  Privacy and Cookie Policy  ,  Links  ,  Website Rules