, so that excess solar generation can not be «rolled over» from month to month, like cell phone minutes. (energyandpolicy.org)
If patients stick to the treatment, the system sends a code through a central server and rewards them with free cell phone minutes. (discovermagazine.com)
The overall cost of cell phone minutes using a provider with billing plans is much less expensive then those compared to buying minutes from a pre-paid cell phone provider. (consumerbadcreditguide.com)