Default [Q] LG G3 D855 from Hong Kong - want 4G

Hi , I have the LG G3 D8555 , from Hong kong, and i cannot get 4G in the UK, I seen someone on this site had told how to to get 4G with a G2 phone,

Type in dialer:

3845#*802#,then the secret menu will come up...Then:

1. Go to LTE-Only
2. Modem Settings
3. RAT Selection
4. Select GSM / WCDMA / LTE auto

Job done...

This was Senior Member stefan063, can anyone please help me
Thanks