Orange Pkg

What is best mobile phone deal, based on Sim card only pkg?
As far as i can see
02 — £30.00 month — online 30 — 1200 mins:1000txts
Orange -£25.00 month –Dolphin –600 mins: unlimited txts
T-Mobile–£30.00 month –Just 30–800 mins: 1500txts
Would appreciate views of anyone on these tariffs, are they as good as they look ? are there hidden costs? any company better that the other ? other points welcomed.
tariff is for grandaughter.
o2……the reason for this is
on the sim card only you can be on £25pm with 600 mins 1000 texts and also get a free bolt on worth £7.50
and with £30pm…you can have the choice of unlimited texts, unlimited o2 to o2 calls, unlimited internet browsin, long weekend calls etc…also if u ever need broadband when o2 braodband in ur area u can hav it as little as £7.50pm with bein on o2!
there is no hidden charges, u just have to watch out 4 the 08 and 09 numbers.
look on there website
www.o2.co.uk