What is the benefit of using I-phone Betfair app over Betfair lite?

well, for a start, betfair lite has turned to sh!t in the last year. continually broken - as well as logging you out literally every 5 minutes.

what arte the 3rd party iphone apps like?

not sure i'm happy typing my username and password in for security.

i'd happily pay for a good one.

agree with viva: sick of having to log in every time I refresh prices or change market. Stick to the app

where can i get the app?

The cheekiest answer would be: Earth.

How many apps are there? Are any betfair 'approved'?

iBetMate is the highest rated one on the AppStore and is certainly worth the £2.99

iphone.betfair.com keeps you logged in for a reasonable amount of time and works fairly well on most smartphones.