Originally Posted by
RichardInSF
. After you install the SIM and download the credit you purchased, it is important that you then order a "rocket pack" or you will be charged for data at a crazy rate.
Is this specific to Tesco mobile?
I would recommend Three PAYG which is 1p/MB and doesn't expire. Other providers may be cheaper for heavy users but this is the simplest. However the SIM is £1-£2 to buy at a shop and they may or may not be sold in Tesco too, and you have to buy vouchers to top up with non-UK cards, and it won't work in old phones that don't do 3G.