Basically i may be in a minority here but my order didn't arrive from ordering on April 29th 2011 to May 14th 2011, contacting the seller turned into a very prolonged unpleasant nasty experience,which i would not want to repeat - i had to literally block the seller from emailing me it got so bad.(the seller I encountered was NOT "Time to talk,Swansea" that currently supply this) They are reliable and courteous.
I Would not recommend the company based in Blackpool i ordered from.,they were Incredibly rude and pompous.Everything appears to be my fault despite my not being supplied the ordered goods by the company with my money.
So the watchwords here is never mind these costing pennies from amazon marketplace - the people who supply them do get commission on shifting sims,and you need to look at the "at a glance section" of who your buying one from to be sure it's likely to arrive and their comments aimed at genuine grievances.
I have a Massive email log which reads like the complete works of Dickens from the company i ordered from - they would rather argue than admit they'd not delivered this. Don't waste your energy on suppliers with contempt for the customer is my strong personal opinion and advice to anyone with any delay in supply from their seller - just forget you ordered anything.
Mine did not accept any responsibility and mocked me,then even worse they called my Mother to discuss my account with her,which is not legal.
Any minute soon i expect this guy to turn up outside my door he's so full of passion for an argument,this is the wrong kind of passion in business,had this company ever wanted my custom for A new phone - they have now lost that chance.
So in short i did not know what an o2 payg sim performed like via the seller i used, even though i had paid the monies asked for the supply of one.
I eventually found one in a shop free of charge and the o2 Network is as reliable as Vodafone -so highly recommended as a product.