MISSOULA, Mont. (AP) — Missoula's ban on the use of cellphones while driving transitions tomorrow from an educational phase involving warnings to one with citations carrying fines up to $300. The Missoulian reports that a second citation can lead to a fine of up to $500. The ban allows for the hands-free use of cellphones, such as putting a caller on speakerphone or using ear buds with a microphone.