With Apple only allowing you one micro SIM (and charging 20p!), and tariffs fluctuating as the three operators count down to May 28th, the only sensible option is to get all three SIMs delivered in advance. Can people update this thread as this becomes clearer?
Orange
Shipping from 20th May - set up a direct debit online for £0.00 buy clicking here and selecting buy...
Orange micro SIM
Vodafone
Not sure on the protocol here - this is the one that Apple is sending me. However, start here..
Vodafone Micro SIM
O2
Micro SIMs now available to order - allow up to 14 days for delivery. Details here...
O2 micro SIM
Let's hope the volcano doesn't delay shipments! (as suggested in Guardian Technology this morning).
amjb