£20 on giffgaff? You must make a lot of calls to non-giffgaff users on the go. And how were you paying £80 before?

The advantage of having a smartphone is that you can get by easily on something like their £10-12 plan simply by using data to make free skype/gtalk/SIP calls and everything else is unlimited anyway.

Battery and general reliability wise, nothing beats a good old Nokia though!