2BE was the first radio station to broadcast in Northern Ireland. The BBC station started transmissions in Belfast on September 15th 1924 on 435m (689 kHz).
On January 6th 1935 the service was renamed as Northern Ireland Regional Programme and on March 20th 1936 the Belfast transmitter was replaced by a more powerful transmitter broadcasting from Lisnagarvey on 307m (977 kHz).
The station became BBC Northern Ireland Home Service from 1945. It formed part of the North Regional Service due to a shortage of frequencies – it was on 261m. It became an opt out in its own right in January 1963 when it operated on its own frequency of 224m (1340kHz).
The BBC revamped its channels in 1967 and the Home Service became BBC Radio 4 – with the opt out remaining (BBC Radio 4 Northern Ireland).
Northern Ireland eventually got its own dedicated radio station in 1975 – BBC Radio Ulster.