BlackBerry today is resuming the rollout of iPhone and Android apps for its popular BlackBerry Messenger mobile social messaging service.

In a blog post [1] , the company said the free BBM apps will start showing up in Google Play, Apple App Store and some Samsung App Stores.

In order to make sure all goes smoothly, you'll need to line up for a spot by visiting BBM.com from your phone's browser and entering your information. You'll get an email when your turn comes up.

If you have already signed up at bbm.com [2] you should be able to start using the app immediately.

Last month, the company paused the rollout of the apps after an unreleased version of the Android app was posted online. About a million Android users jumped in seven hours to grab that version, which the company pulled back.

In the blog post, the company noted that more than a million people found a way to "sideload" BBM onto iPhones.

In May, the struggling Canadian firm announced that it would be rolling out BBM, perhaps the company's most popular service, to other mobile platforms. It had been exclusive to BlackBerry smartphones. The service features BBM Chat for instant messaging with other users. Additionally, each user has a unique PIN, so you don't have to give out your phone number to use the service - a privacy feature.

The company has slashed 4,500 jobs in a last-ditch move to recharge the troubled company. BlackBerry has failed to invigorate its business despite unveiling a new smartphone line and software in January. The company is now an acquisition target.

Follow Nancy Blair on Twitter: @nansanfran [3] .