More information about 4G here.
To benefit from 4G, you must:
If your current SIM cards are not 4G compatible.
Request a 4G compatible SIM card from your nearest Orange shop or the nearest service point.
While at the same time retaining your number and your contacts.
If you have a 4G smartphone, 4G tablet, 4G dongle, 4G Flybox, etc., your devices must be 4G compatible.
Select a device then consult Features Tab - Networks and Connectivity as well as the service points.
You must be in an area covered by 4G network.
All the mobile and internet bundles are 4G compatible.