The UK supervision is to explain that Scottish independence would leave mobile phone users confronting aloft bills.
In a latest paper on a 2014 referendum, it raises a probability of Scottish callers confronting roaming fees when they revisit England.
The paper also claims independence could bluster postal services and farming broadband provision.
The Scottish supervision has forked out that EU manners meant roaming charges will be capped by subsequent summer.
The paper drawn adult in Westminster will explain that, after independence, Scottish mobile users travelling to a rest of a UK would be charged a reward for creation calls “abroad”.
It warns that people tighten to a limit could inadvertently catch these charges if their mobile phone connected to a pillar on a English side.
The paper also suggests a “world category services and economies of scale” of a post bureau could be put during risk and claims there competence be reduction income to hurl out high speed internet services for smaller communities.
UK Consumer Minister Jo Swinson said: “The UK’s integrated infrastructure connects people and communities, creates jobs and supports trade.
“The supervision is committed to progressing universe category postal and broadband services. This includes delay of a six-day-a-week postal smoothness use and a sustenance of broadband to farming areas.”
She added: “If Scotland left a UK, posting a minute or creation a call could cost some-more – and there could be reduction choice for customers.”
The Scottish supervision discharged a claims and pronounced unbroken Westminster governments had “substantially weakened” Scotland’s communications infrastructure.
A mouthpiece said: “Since 2002, some-more than 400 Scottish post offices have sealed and skeleton for privatisation of Royal Mail threatens jobs and a operation of a concept use requirement while people opposite farming Scotland frequently onslaught with a miss of mobile phone coverage as a stream complement fails to broach for Scotland.
“Independence will yield an event to scrupulously support a postal network with entrance to a satisfactory share of UK assets.”
On mobile phone charges, she added: “The UK supervision should acknowledge that a EU is looking to mislay roaming charges totally and they are widely approaching to be abolished good before 2016.”