The mobile network GoMo says it is working to fix an issue with some customers not receiving 'verification' texts for some services.
It affects anyone looking to get their number confirmed for banking reasons or any service that needs a two-step authentication.
The operator, which launched in October last year and is owned by Eir, says the problem is outside of its control.
At the time of the launch, Eir said it was investing over €150m in the upgrade all its existing masts with the latest 4G network technology.
It was also increasing its 4G footprint by 25% - which it said will deliver even faster data speeds.
Bríonan Kennedy is head of digital sales with GoMo.
She puts the verification issue down to the amount people who have joined the network.
"It happens when a customer moves their number from one network to another.
"And what happens is the national database, which is used for these verification texts, is not refreshed as quickly as people would want".
"It happens across all networks today - but with the high volume we've had of customers moving over, it's come to the forefront.
"But it is something that happens on a daily and a weekly basis with all networks".