Matt Birchler predicts that the new foldable iPhone's unit sales will lag behind other iPhone models for at least two years. He believes the foldable iPhone will not fail but will see increasing sales annually for its initial years. His reasoning includes the growing market share of foldable phones in the Android world and his positive personal experience with a similar device. However, the author disputes the claim about increasing foldable market share, citing industry reports placing it at a mere 1.6% to 2% of the global smartphone market. The author finds this statistic hard to believe based on personal observations, suggesting the actual percentage is likely lower. These small percentage gains are compared to insignificant growth rather than substantial market penetration. Birchler suggests "iPhone Folio" as a name, but the author finds it too descriptive of the form factor. The author acknowledges that "iPhone Ultra" is a likely name but dislikes it due to potential future naming conflicts for larger versions. He personally favors "iPhone Duo" for its historical context and complementary sound.