Using the iPad Air .....
From Apple(US -
Apple - iPad Air - Technical Specifications) site ....
Wi-Fi (802.11a/b/g/n); dual channel (2.4GHz and 5GHz) and MIMO
Bluetooth 4.0 technology
UMTS/HSPA/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz)
CDMA EV-DO Rev. A and Rev. B (800, 1900 MHz)
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26)3
Data only4
From Apple (NZ -
Apple - iPad Air - Technical Specifications
Wi-Fi (802.11a/b/g/n); dual channel (2.4GHz and 5GHz) and MIMO
Bluetooth 4.0 technology
UMTS/HSPA/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz)
CDMA EV-DO Rev. A and Rev. B (800, 1900 MHz)
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26)3
Data only4
From Apple (UK -
Apple (United Kingdom) - iPad Air - Technical Specifications)
Wi‑Fi (802.11a/b/g/n); dual channel (2.4GHz and 5GHz) and MIMO
Bluetooth 4.0 technology
UMTS/HSPA/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz)
CDMA EV-DO Rev. A and Rev. B (800, 1900 MHz)
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26)3
Data only4
I suggest you go back to the shop and ask them to show you on the spec sheets exactly where these supposed differences are !