Because the charges are buried in multipage phone bills, consumers don’t notice ... carriers are under no legal obligation to waive the fees or pay for fraud that occurs over their system.

But traveling to most countries will require you to pay mobile roaming charges if you try to use data services, make voice calls or send text messages on your phone as normal. If that's your plan ...

The regulator found firm employees were using unapproved texting apps for business and failing to archive the communications.