Pre-Paid Phone Cards
VoIP has become an important technology
for phone services to travelers, migrant workers and ex-pats,
who either, due to not having a fixed or mobile phone or high
overseas roaming charges, choose instead to use VoIP services
to make their phone calls. Pre-paid phone cards can be used either
from a normal phone or from Internet cafes that have phone services.
Developing countries and areas with high tourist or immigrant
communities generally have a higher uptake.
VoIM
Voice over Instant Messenger,
like popular Skype, Voice over MSN, Yahoo, QQ in China and Google
Talk. VoIM is one kind of general VoIP that was based on an IM. VoIP, specifically, usually is referred as traditional SIP or
H.323 IP phone, as opposed to VoIM as newly emerged Skype-like
services/phones.