The E72 supports actually two network types, GSM and UMTS. GSM networks also known as 2.x generation operates in 4 different frequencies worldwide: 850, 900, 1800, and 1900. All E72 hardware versions support all 4 networks. It means that in any GSM network you’ll be able to do basic phone calls, SMS and maybe browsing the internet in slowly.

UMTS networks known also as 3.x generation provides fast internet connectivity and additional services such as video conversation. UMTS networks supports one or two of the following frequencies: 850, 900, 1900 and 2100.

E72 has 3 hardware version to support  UMTS networks worldwide:

• E72-1 Support – 900/2100
• E72-2 Support – 850/1900
• E72-3 Support -850/2100

Buying version that does not fit your home network wont allow you to use high speed internet or in some networks which are based only on UMTS, connecting to the network at all.

E72 version appears on the box sticker, under the battery or by typing *#0000# (Fourth line)