You still have access to all the usual services like 1471 and 1571. If you switch your line rental over to first:telecom you will keep the same phone number.
No, you can keep your internet service (including broadband) just as it is.
If you dial up to the internet using an 0844 or 0845 number, you will see these calls appear on your first:telecom bill.
If you move house it's easy to take your first:telecom service with you. Simply tell customer services as soon as you have your new details (at least 14 days before moving) and we will take care of everything else.