Looking to bring your own device to a new line of service with AT&T? They’ve started offering a SIM card-only option in their online store. For $10.00 minus a $5.00 "online discount" you can start your very own line of AT&T service. This option looks to be tailored towards customers that already have an unlocked or AT&T-locked wireless handset. From what we can tell, you’re free to pair the SIM card with any of AT&T’s current plan offerings, though you’ll still have to commit to a 2-year agreement for anything other than the pre-paid options. Nothing revolutionary here as you could always use your own phone, but it’s a good step towards greater customer freedom, so you won’t find us complaining.