T-Mobile USA provides unlimited incentive for families

T-Mobile USA Inc. ratcheted up the heat in the unlimited calling wars by throwing out a new offer for families that allows customers to add additional lines for $50 per month.
The plan allows for two lines of service with unlimited calling as well as text, picture and video messaging for $150 per month. Additional lines with the same features cost $50 per line for up to three additional lines. A single line with the unlimited features remains priced at $100 per month.
The new plans undercut competing offers from rivals by a substantial mark. Sprint Nextel Corp. offers two lines of unlimited calling and unlimited text, picture and video messaging for $175 per month. (Sprint Nextel offers its all-inclusive Simply Everything plan, which includes unlimited data and navigation services, for $195 per month for two lines.) Both AT&T Mobility and Verizon Wireless offer unlimited calling plans without messaging for $100 per month and do not provide discounts for multiple lines.
Verizon Wireless kicked off the new push for unlimited calling at the $100 per month price point earlier this year, and was quickly followed by AT&T Mobility, T-Mobile USA (which upped the ante by including unlimited texting) and finally Sprint Nextel, which went further by adding unlimited data services.
A number of regional players also offer unlimited calling plans, though some are limited to select markets, as well as some of the remaining mobile virtual network operators.