Uncomplicated and practical, always a SIM (and phone number) to have in reserve. Be it as an emergency phone, which is always in the glove compartment to make Handyvergesser at a festival spontaneously reached or surrendered for personal accessibility during projects, ebay, classified ads, without a number that has been a lifetime. And of course, if one mobile apps developed and SIMs need for some testers. Thank O2 for this cheap and comfortable way, the flexible and low makes mobile numbers as email addresses, it is for some time!
