Please hold the line halfway through a call

[Merv]

When calling my dad who is on sky glass and talk, he keeps getting please hold the line during a call. I can ring any other number and it's fine  just on his line.

[TimmyBGood]

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@Merv wrote:

When calling my dad who is on sky glass and talk, 

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Presumably Sky Broadband and its bundled Sky Talk. 

Sky Glass is a television set and streaming content subscription.