Ellis then cheekily decided to text the number and wrote: "Hi. What are you up to?"
Speaking to the Sun on Sunday, the love-struck trucker said: "I was curious to know if it was a real human being. We still laugh about it."
Roberts, a legal secretary, was at first perplexed by how Ellis had found her number, but the couple soon struck up a conversation and met just days later.
The couple now have two kids, aged eight and nine, though they are unaware of how their parents first met.
Roberts added: "I usually say that he texted me by mistake."