[GadgetKen]

The 2 cent per minute rate for US to US calls is incredibly inexpensive. Lyca uses T-Mobile towers so people considering it should compare coverage as well as cost with AT&T MVNO's. One website also reports that you need at least one billable event every 90 days to maintain service (cellguru.net).

I use H2O (an AT&T MVNO) for the primary sim in my dual sim phone and Telna Mobile (using mostly T-Mobile in the USA) for the secondary sim card. Both sim chips have inexpensive USA rates, but not as cheap as Lyca Mobile. Lyca won't work for me though because I need the AT&T coverage footprint more in the US. T-Mo is more of a backup for me. Plus Telna has better international roaming rates than Lyca does (at least for Canada, Mexico, non-US Caribbean; European roaming rates are more competitive).