The fourth movie in the series is not numbered, instead being called The Final Destination, implying that it's the last movie in the series...and then Final Destination 5 comes out. The brilliance only comes at the end of Final Destination 5, when the last two survivors of the bridge collapse die by being on board Flight 180—the opening disaster from Final Destination. It's a prequel, which means the fourth movie is still chronologically the last.
In Final Destination 5, cell-phone addict Dennis carries around an older, clunky model. This troper remembers thinking it was strange, until we realize the movie is a prequel and that's the kind of cellphones they had back then.