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[karmaman]

What exactly is evening and weekend calls boost?

[Gliwmaeden2]

It is what it says on the tin - 7pm till 7am (weekdays) and all weekend. See full details in this article:

https://community.talktalk.co.uk/t5/Articles/About-our-Boosts/ta-p/2204813

You can easily find this sort of information via the forum search engine.