No , the evidence that porting a phone number ceases any associated broadband is anecdotal , but if you wish to ‘prove’ it , start your number port journey by contacting Freeola , you should get pretty quickly a communication saying ‘sorry you are leaving’ , obviously you could interpret that as leaving only the telephone service , but you only have one BT account that you can ‘leave’ , the fact is you have no agreed contract for broadband as a standalone service , so ceasing one element (telephone) by default ceases the existing contract that includes broadband , expecting this to be explicit somewhere on the BT site is optimistic.
It may be that recently BT have managed to unlink telephone and broadband so that getting rid of one part doesn’t affect the other but I’d be surprised if that were the case , the terms you agreed were for a bundle of services, what agreement do you have once the initial terms are breached by you taking the phone number elsewhere ?
TBH apart from not having to consider telephony again if moving from EE broadband in the future what’s the appeal ? , your choice of VoIP providers PAYG standing charge is more than twice the typical EE PAYG price , although the price per minute may be better, but if you are anything other than an occasional caller, surely an inclusive call plan is better ( so the pence per minute fee is irrelevant ) .
Personally I can’t see the advantage of using this VoIP provider over EE for telephony, even their limited inclusive calls isn’t particularly compelling compared to BT/EE unlimited minutes inclusive calls plan (£12 after negotiations ) , but that’s your choice .
