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What phones (make and model) are you both using?
I know that some Samsung Galaxy phones have a habit of spontaneously losing the APN settings for some reason.
Or maybe you both reset your phones to default settings in an attempt to get a connection again during the network outage yesterday?
Did you switch off and on again?
Are your internet settings still correct?
Some people reported that they lost their internet settings during the outage.
No idea how/why unless they reset their phones to factory defaults or they were using Samsung Galaxy phones which seem to have a problem whereby they sometimes spontaneously lose their settings.
Check that your settings are as follows:
APN: 48months.liffeytelecom.comMMSC: http://mmc1/servlets/mmsMMS Proxy: 10.1.11.19MMS Port: 8080MCC: 272MNC: 11APN Type: * or default,mms,supl
Leave all other fields blank/not set (including Authentication type).
Make sure that data roaming is enabled.
Hope this helps.