iMessageApple will be forced to face a U.S. federal lawsuit after failing to tell consumers that their text messages could be stuck in purgatory if they ditched their iPhone in favor of a smartphone on another platform.

Reports of the so-called "iMessage purgatory" issue have persisted for months, but made headlines in May when a California woman, Adrienne Moore, sued over the issue after switching to a Samsung Galaxy S5 from an iPhone 4. Apple sought to have the case thrown out, but Cupertino wasn't so lucky.

U.S. District Judge Lucy Koh on Monday said that Apple must face Moore's claim that the message blocking interfered with her Verizon Wireless contract. Moore is seeking class-action status and unspecific damages.

Apple's iMessage is a convenient way to chat with other iOS users without eating into your monthly text allotment. But if you ditch your iPhone for a smartphone on another platform, and do not switch off iMessage, your messages will be delivered to your old iPhone, even if it's no longer in use.

Moore claims Apple failed to mention that its messaging system would block the delivery of messages from other iPhone users after switching to a non-Apple device.

The legal setback comes after Apple over the weekend finally released a tool to help those whose messages were stuck in iMessage purgatory. Apple's online tool lets you deregister iMessage on your old phone.

On Apple's new website, enter the phone number you want to deregister from iMessage and Apple will send a confirmation code to your current device. When you get that code, enter it on Apple's website, and Cupertino will deregister it.