If your SIM is actually a green EE one then use the word:
everywhere
for your APN name.
The Orange one you have was replaced in 2012 when 4G arrived with the EE branding.
Otherwise have you checked you have signal?
plusnet unlimited fibre 80/20 (since 2 Jun 14) - at 470m distance
Sync as of 24/Jun/18 - 62,153 / 9,441 - G.INP enabled with 3.0 dB SNRm
19 years of broadband, from 1999's ntl:cable modem trial - Live BQM