"A Bolt-on is an additional bundle of voice minutes, text messages or data that customers may add to their core plans, to ultimately create the mobile plan that best suits their lifestyle. The “bolt-on prepaid plan” is an optional (“Opt-in”) plan that prepaid customers regardless of their basic/existing prepaid plan (such as Pay as You Go, ANYTIME, Friends & Family or Corporate CUG) may add to their existing service. NB - Opt-in means that Flow customers will not automatically receive the service."