Making a big case about voter turnout not being as great as other countries is a red herring. We have it really, really good in this country. So good that, practically speaking, it doesn't matter who gets elected because things will continue to stay good. I read low voter turnout as an implicit vote of confidence in the system as a whole. You can be sure that if [stuff] was actually hitting the fan then everyone woul…
Look at a map of voter turnout in Europe, and ask yourself is that REALLY credible.
It's more likely that US low turnout is because, for many voters in many elections, their vote is kinda meaningless. If you live in California or Texas your vote in a presidential election is meaningless, say, and probably also in a senate election. Depending on your district, your vote in a house election is probably also meaningless; most are not competitive.
As a general rule turnout is higher in countries using some form of proportional representation, as individual votes are far more likely to be impactful there (in a PR-STV system, for instance, it is pretty rare that all of a constituency's representatives are effectively decided before the election, whereas that's the case in the majority of US districts).
Other factors; most US states have rather short ballot opening hours compared to other democratic countries (In Ireland, say, we generally have voting from 7am-10pm or so), and the US population is more dispersed than most developed countries, making traveling to a polling station more difficult.
That said, voting by phone is an obviously unacceptable solution, as it destroys the secret ballot.