Ok this is my first tab, so don't be to harsh. I am pretty sure it is accurate, or fairly close.

Standard tuning, and for an added accuracy turn the High knob on your amp pretty high up.

Intro -listen to song for timing, but the intro is slightly slower than the rest of the song
G----------------------|
D--5----5---23202------|
A-3-3-0--3-3-----3-----|
E---------3------------|

Verse 1/Chorus -this is the basic lick, you can add some filler like Kelly did, but this 
the basic idea
G-----------|
D-----------|
A-2-2---2-2-|
E----2-2----|
She calls me on the phone...

Pre Chorus 1 - not quite sure on this
G------------|
D------------|
A-33---8p7h8-|
E---33-------|

Verse 2 - again, basic lick, you could add some variation if you get bored with it
G---------|
D---------|
A---------|
E-22222222 -after the second chorus, accent on the first 2
Sometimes she says she's my mom...

Pre-chorus 2
G--------|
D--------|
A-323----|
E----323-|
shes sleeping on my doorstep

Bridge - listen to the song, comes in a little after John starts singing
G----------------|
D----------------|
A-3/11-34303-----|
E-----------2222-|
i almost gave up hope...

ok, and here is the order

Intro
Verse 1
Pre-chorus
Chorus
Intro
Verse 2
Pre-chorus 2
Chorus
Verse 2
Bridge
Verse 1
Intro