I'm in exactly the same position with the same phone and tariff,
I thought i'd work it out properly with some numbers...
On your current phone, youve paid £35 x 18 months, equalling £630
which gave you 600mins and 500 texts a month.
A currently available simplicity SIMonly deal offers 800 mins and
a whopping 1600 texts, with the Webbolt on selected for £19.58 a
month if you choose the 12 month option. Slightly fewer on the
1 month no commitment Simplicity SIM.
http://shop.o2.co.uk/simplicity-12Now, the price of the phone in your current £35 a month deal is
therefore costing you £15 a month, so over 18 months of your current
contract, so I work that out at £270 of the £630 you've paid...
I got my N95 for Free, but at one time I'm sure it was a chargeable
phone, in he early days it was £150 or thereabouts, so factor that
in if you had to pay for it. I might have been lucky as an existing
retentions customer, I dont know...
So...the £150 credit isn't looking so rosy now. Tempting, but the
numbers dont work in your favour.
If you buy a PAYG iPhone 3GS at £440, and if you chose to keep your
existing contract going at £35 a month, over 18 more months, that
Iphone would have cost you a whopping £1070, less the £150 credit
so thats now just £920.
You could get the same PAYG iPhone 3GS at £440, buy the Simplicity
SIM for £19.58 (which is more texts and mins) thats now £792.44 over
the same 18 month period. A saving of £127.56
Going onto a new 18 month Contract 3GS will cost £184, and at £34.26
a month, this will come out at £800.68, so thats £8.24 more than
the SIM only deal, but you'd be tied in to an 18 month hard contract
whereas the Simplicty deal would allow flexibility to get a new phone
maybe in a year if the 12 month product cycle appears to stay...
http://www.allaboutiphone.net/2009/06/t ... -on-o2-uk/A lot of maths and calculation work like mine is listed on the link
above. Hope that helps!
Enjoy!