iStockBT workers have voted to take national strike action for the first time in 35 years.
The Communication Workers Union (CWU) announced that workers at BT and Openreach had overwhelmingly voted to take industrial action.
Around 4,500 members in Scotland are believed to be taking part in the strike.
It is understood that the dispute will lead to significant disruption to new and old internal installs.
The strike will also affect the roll-out of broadband significantly, with major delays expected.
Action is likely to have a knock-on effect in damaging internet installs for other companies who use the same cables.
It is the first national strike that BT has faced since being privatised in the 1980s.
CWU general secretary Dave Ward said it is also the first time that a group of call centre workers have voted for industrial action.
A vote by CWU members at EE failed by a few votes to reach the legal threshold for industrial action.
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