Hi @janda, When roaming in another country to service is provided by a partner company in that country if you are not in an area covered by the provider then it will not work, if your device is not compatible with that provider then it will not work.
Hi @dan17, what is FPP? When changing your plan all current promotions/discounts get removed, it will not affect any credits you are getting towards a device if you are financing a device those are applied as a bill credit.
Hi @Srinathiyer2593 You will need to contact customer service directly and they will be able to assist you, please see here for customer service contacts.