Hi hershi.
Personally, I “feel” it is wrong, so I will wait until I leave the davening area if I need to check a voicemail or message.
This reminds me of a story I heard about R’ Moshe Feinstein Zatzal, which I am sure everyone has heard.
Basically, he was seen being driven home at the beginning of that 20 minute period where men have time to do things before taking on Shabbos. Someone approached R’ Feinstein thinking he was chas veshalom mechalel Shabbos. R’ Feinstein explained the situation and that what he saw was permissible, but explained further, “If it did not look right, then it was not right.” and went on to say something to the effect he will be more mindful not to do that again.
If someone knows it more completely and accurately, please post.