The FCC and US wireless carriers are close to agreeing on blanket rules for cellphone unlocking, Reuters reports. Sources say that the deal, expected soon, will likely require telecoms to make sure customers know if their phone is eligible to be unlocked and used on another carrier, process requests for unlocking within two days, and establish rules for prepaid phones that dont fall inside the normal contract-based system. Right now, the FCC is apparently hammering out final details, including how exactly people will get prepaid phones unlocked and how to avoid black markets of unlocked phones bought with subsidies and then sold at a discount. If an agreement is reached, it could mark a significant step forward in establishing best practices on cellphone unlocking, albeit not a full solution to the problem.