Now, Theresa May's government has confirmed that if the United Kingdom leaves the European Union without a deal - as is the default option - on March 29 this year, that consumer protection will no longer apply.
Per HuffPost, a set of regulations - entitled the Mobile Roaming (EU Exit) Regulations 2019 - presented to parliament on Tuesday, state that the United Kingdom will be revoking the legislation that protects you from extra costs when using your phone while travelling in another EU country.
While UK networks have previously stated that there are "no plans" to bring back data roaming charges, the government has formally announced that limitations would be immediately lifted in the event of a no-deal Brexit. Prior to this law coming into force in 2017, some operators were charging their United Kingdom customers as much as £1/minute for calls and £1/mb to use the internet while travelling in France, Spain, Germany or beyond, which quickly adds up.
A note alongside the Mobile Roaming (EU Exit) Regulations 2019 explained that the government rejected a proposed new scheme from consumer groups to maintain the now agreement after "careful consideration", according to the HuffPost.
Free mobile roaming charges law ends with no-deal Brexit
But "after careful consideration, the Government decided not to adopt this proposal", it says.
A no exit agreement means "it will not be possible to impose a limit on the wholesale charges faced by United Kingdom operators when their customers use networks owned by European Union operators", it added.
"Additionally, operators also raised concerns that a limit on the costs that could be passed on to customers would affect the sustainability of certain roaming services".
In new draft regulations laid before Parliament this week - the Mobile Roaming (EU Exit) Regulations 2019 - the current system caps will have no legal force if there is a no-deal Brexit.More news: Freezing rain warning issued for Halifax area
Last week, the consumer website MoneySavingExpert.com revealed that just two out of 12 major mobile phone firms had committed to keeping roaming "free" after Brexit.
Mr Watson asked Culture Secretary Jeremy Wright to secure binding commitments from the telecoms companies to protect consumers in the event of a no-deal Brexit.
Ten companies, estimated to have at least 85 per cent of United Kingdom mobile users, say they have "no plans" to change their roaming policies but have not ruled out the return of charges.
An O2 spokesperson said: "We now have no plans to change our roaming services across Europe".More news: 34 die in UP, Uttarakhand after drinking spurious liquor in Haridwar village
Mr Wright earlier said the Government intends to ensure the requirements on mobile operators to apply a financial limit on data usage while overseas is retained in United Kingdom law, and would be set at £45 for each monthly billing period - the same as the existing limit.
BT and EE Mobile said in a joint statement that "Our customers enjoy great value products and controls offering inclusive roaming in Europe and beyond, and we don't have any plans to change these offers".More news: US in direct contact with Venezuelan military, urging defections