Three has announced that it has abolished roaming charges in seven countries across the world including the Republic of Ireland, Australia, Italy, Austria, Hong Kong, Sweden and Denmark.
The move comes in the wake of a series of clampdowns in roaming charges by various European countries.
Pay monthly customers will be able to use the free minutes, texts and data on their tariffs with no extra charges. Those on unlimited plans will be subject to some restrictions.
Thomas Malleschitz, marketing director at Three, said: "By abolishing expensive roaming charges in select countries, we are allowing our customers to get even more value from their minutes, texts and data abroad by removing the fear associated with staying in touch while travelling."