Apple iPhone

General     2G Network     GSM 850 / 900 / 1800 / 1900
SIM     Mini-SIM
Announced     2007, January. Released 2007, June
Status     Discontinued

Apple iPhone 3G

General     2G Network     GSM 850 / 900 / 1800 / 1900
3G Network     HSDPA 850 / 1900 / 2100
SIM     Mini-SIM
Announced     2008, June. Released 2008, July
Status     Discontinued

Apple iPhone 3GS

General     2G Network     GSM 850 / 900 / 1800 / 1900
3G Network     HSDPA 850 / 1900 / 2100
SIM     Mini-SIM
Announced     2009, June. Released 2009, June
Status     Discontinued

Apple iPad Wi-Fi + 3G

Also known as Apple iPad Wi-Fi + 3G Early 2010.
Tablet with no GSM voice communication capabilities
General     2G Network     GSM 850 / 900 / 1800 / 1900
3G Network     HSDPA 850 / 1900 / 2100
SIM     Micro-SIM
Announced     2010, January
Status     Available. Released 2010, March

Apple iPhone 4 CDMA

This is not a GSM device, it will not work on any GSM network worldwide.
General     2G Network     CDMA 800 / 1900
3G Network     CDMA2000 1xEV-DO
SIM     Micro-SIM
Announced     2011, January
Status     Available. Released 2011, February

Apple iPad Wi-Fi + 3G

Also known as Apple iPad Wi-Fi + 3G Early 2010.
Tablet with no GSM voice communication capabilities
General     2G Network     GSM 850 / 900 / 1800 / 1900
3G Network     HSDPA 850 / 1900 / 2100
SIM     Micro-SIM
Announced     2010, January
Status     Available. Released 2010, March

Apple iPhone 4 CDMA

This is not a GSM device, it will not work on any GSM network worldwide.
General     2G Network     CDMA 800 / 1900
3G Network     CDMA2000 1xEV-DO
SIM     Micro-SIM
Announced     2011, January
Status     Available. Released 2011, February

Apple iPhone 4

General     2G Network     GSM 850 / 900 / 1800 / 1900
3G Network     HSDPA 850 / 900 / 1900 / 2100
SIM     Micro-SIM
Announced     2010, June
Status     Available. Released 2010, June

Apple iPad 2 CDMA

Also known as Apple iPad CDMA Early 2011
Tablet with no support for GSM voice communication

This is not a GSM device, it will not work on any GSM network worldwide.
General     2G Network     CDMA 800 / 1900
3G Network     CDMA2000 1xEV-DO
SIM     Mini-SIM
Announced     2011, March
Status     Available. Released 2011, March

Apple iPad 4 Wi-Fi

Also known as Apple iPad with Retina display
This is not a GSM device, it will not work on any GSM network worldwide.
GENERAL 2G Network N/A
SIM No
Announced 2012, October

Apple iPad mini Wi-Fi + Cellular

GENERAL 2G Network GSM 850 / 900 / 1800 / 1900 - A1454; A1455
  CDMA 800 / 1900 / 2100 - A1455
3G Network HSDPA 850 / 900 / 1900 / 2100 - A1454; A1455
4G Network LTE 700 MHz Class 17 / 1700 / 2100 - A1454
  LTE 700 / 850 / 1800 / 1900 / 2100 - A1455
SIM Nano-SIM
Announced 2012, October
Status Available. Released 2012, November

Apple iPad mini Wi-Fi

This is not a GSM device, it will not work on any GSM network worldwide.
GENERAL 2G Network N/A
SIM No
Announced 2012, October
Status Available. Released 2012, November

Apple iPhone 5c

LTE carrier support
GENERAL 2G Network GSM 850 / 900 / 1800 / 1900 - all versions
  CDMA 800 / 1700 / 1900 / 2100 - A1532 (CDMA), A1456
3G Network HSDPA 850 / 900 / 1700 / 1900 / 2100 - A1532 (GSM), A1532 (CDMA), A1456
  HSDPA 850 / 900 / 1900 / 2100 - A1507, A1529
CDMA2000 1xEV-DO - A1533 (CDMA), A1453
4G Network LTE - all versions
SIM Nano-SIM
Announced 2013, September
Status Available. Released 2013, September

Apple iPhone 5s

LTE carrier support
GENERAL 2G Network GSM 850 / 900 / 1800 / 1900 - all models
  CDMA 800 / 1700 / 1900 / 2100 - A1533 (CDMA), A1453
3G Network HSDPA 850 / 900 / 1700 / 1900 / 2100 - A1533 (GSM), A1453
  CDMA2000 1xEV-DO - A1533 (CDMA), A1453
  HSDPA 850 / 900 / 1900 / 2100 - A1457, A1530
4G Network LTE- all models
SIM Nano-SIM
Announced 2013, September
Status Available. Released 2013, September

Apple iPad mini 2

LTE carrier support
Available as:
Apple iPad mini 2 Wi-Fi + Cellular with 3G/LTE support
Apple iPad mini 2 Wi-Fi with Wi-Fi only and no GPS support
GENERAL 2G Network GSM 850 / 900 / 1800 / 1900
  CDMA 800 / 1900
3G Network HSDPA 850 / 900 / 1900 / 2100
  CDMA2000 1xEV-DO
4G Network LTE
SIM Nano-SIM
Announced 2013, October
Status Available. Released 2013, November

Apple iPad Air

Also known as Apple iPad 5
LTE carrier support
Available as:
Apple iPad Air Wi-Fi + Cellular with 3G/LTE support
Apple iPad Air Wi-Fi with Wi-Fi only and no GPS support
GENERAL 2G Network GSM 850 / 900 / 1800 / 1900
  CDMA 800 / 1900
3G Network HSDPA 850 / 900 / 1900 / 2100
  CDMA2000 1xEV-DO
4G Network LTE
SIM Nano-SIM
Announced 2013, October
Status Available. Released November 2013