almost, except the HTTP headers will say "iphone" on one and "ipad" on the other, making it bleeding obvious to anyone wanting to check. ( dont know if this is how the networks monitor, but its certainly available option)
you might want to look at the Motorola Razr i phone, its often on a deal under £200 new/not refurb. Its not as good as the top phones, but is considered a solid tier 1 device. an Everton or Fulham phone if you will. The Huawai phones are getting good reviews too.
on reception, how is...