By establishing dealerships with wireless carriers overseas , Telestial was able to offer travelers a local cell phone service at local rates with a local cell phone number as an alternative to an expensive phone rental and later , convenient but expensive international roaming .
By establishing dealerships with wireless carriers overseas , Telestial was able to offer travelers a local cell phone service at local rates . 
 Telestial is an alternative to an expensive phone rental and convenient but expensive international roaming .