Your BBM Shop stickers and subscriptions are associated with your BlackBerry ID. If you switch to an Android™ or a BlackBerry device, the stickers and subscriptions you purchased are moved to your new device when you sign in to BBM. If you're switching to an iOS device, your stickers are only moved if you are switching from another iOS device.
When you switch devices, you continue to have access to subscriptions you purchased. However, when it comes time to renew your subscription, be sure to renew it on your new device.