1800 MHz band for 2G & 4G - and 2100MHz for 3G..... The same as all other networks.
If a phone is EE locked, it means that the device is restricted to use only on the EE network in the UK. Users cannot use the phone with other carriers unless it is unlocked, which usually involves a process provided by EE, often requiring the phone to be fully paid off and meeting certain criteria. This locking prevents the use of SIM cards from other networks.
900 & 1800MHz
Witness - UK band - was created in 1997.
Witness - UK band - ended in 2004.
Salem - UK band - was created in 1980.
Tempest - UK band - was created in 1974.
Halo - UK band - ended in 2004.
Halo - UK band - was created in 1999.
Solstice - UK band - was created in 1990.
Doom - UK band - ended in 2005.
Doom - UK band - was created in 1987.
Jade - UK band - was created in 1970.