Why did Marshall text Lily from Barney’s work cell?

In the “3 days rule” episode when Barney and Marshall were pretending to be Holly to prevent Ted from calling her too early, Marshall blows their cover when Marshall texts Lily about bringing home takeout. We later find out that they changed Holly’s number to Barney’s work cell phone in Ted’s phone.

So why was Marshall texting Lily from Barney’s phone? 😆 Does Barney have lily’s number saved in his work phone and a text history? Was this before text histories?? I didn’t think so.

I assume this is just a plot joke but it occurred to me when I was watching the episode for the millionth time last night.