Originally I could not get my T610 to use an email client with Orange PAYG,
an Orange shop even told me it was not possible, but if you want a monthly
account of only £xx then it will work!
Luckily an enquiry to the Orange website (contact us my email, general
enquiry) emailed me a very clear step by step procedure for setting this up
for PAYG.
It works! Admittedly with an Orange mail address, presumably it will work
for other addresses.
Doesn't say much for some shop experts though.