At this time 'on board' modems are built to an international standard.
There are subtle differences with ADSL modems and DSL Modems in each
country. One step forwards and half a step back.
Until an international standard is defined for ADSDL, then one cannot expect
manufacturers to make a unique Laptop for each country.
You'll have to make do with an external ADSL modem and use your ethernet or
USB port.
Currently these are the main 'flavours' of A / DSL:
DSL: (digital subscriber line) a technology that exploits unused frequencies
on copper telephone lines to transmit traffic typically at multi-megabit
speeds. DSL can allow voice and high-speed data to be sent simultaneously
over the same line. Because the service is 'always available,' end-users
don't need to dial in or wait for call set-up. With DSL you are wired for
speed.
Asymmetric flavors [ADSL]
Asymmetrical variations include: ADSL, G.lite ADSL (or simply G.lite), RADSL
and VDSL. The standard forms of ADSL (ITU G.992.1, G.992.2, and ANSI
T1.413-Issue 2) are all built upon the same technical foundation, Discrete
Multi Tone (DMT). The suite of ADSL standards facilitates interoperability
between all standard forms of
ADSL.
ADSL: (Full Rate asymmetrical DSL) ADSL offers differing upload and download
speeds and can be configured to deliver up to six megabits of data per second
(6000K) from the network to the customer that is up to 120 times faster than
dialup service and 100 times faster than ISDN. ADSL enables voice and
high-speed data to be sent simultaneously over the existing telephone line.
This type of DSL is the most predominant in commercial use for business and
residential customers around the world. Good for general Internet access and
for applications where downstream speed is most important, such as
video-on-demand. ITU-T Recommendation G.992.1 and ANSI Standard T1.413-1998
specify full rate ADSL.
G.lite ADSL (or simply G.lite): The G.lite standard was specifically
developed to meet the plug-and-play requirements of the consumer market
segment. G.lite is a medium bandwidth version of ADSL that allows Internet
access at up to 30 times the speed of the fastest 56K analog modems ~ up to
1.5 megabits downstream and up to 500 kilobits upstream. G.lite is an
International Telecommunications Union (ITU) standard, globally standardized
interoperable ADSL system per ITU G.992.2.