Telecomunicações Móveis Nacionais (TMN), Portugal's first and largest mobile network operator, was later integrated into the MEO brand in 2014 after two of TMN's shareholders, Telefones de Lisboa e Porto (TLP) and Marconi Comunicações Internacionais (the Portuguese operations of the UK-based Marconi Company) were acquired by Portugal Telecom in 1994 and 2002 respectively.

In May 2009, PT Portugal (now Altice) announced, after digital terrestrial television (TDT) transmissions had started, that the triple play service was also available with fiber optic speeds can achieve 400 Mbit/s.

In 2013, MEO launched a quadruple play service called M4O that in addition to the functionalities already referred has added the mobile phone, in a converged strategic logic.

[5] 1991 1992 1993 1994 1995 1996 1998 1999 2000 2003 2005 2007 2008 2009 2010 2011 2012 2013 2014 2015 2017 2018 2020 2023 2024 The communication campaign invested in a strong advertising effort, protagonized by Portuguese humoristic characters, the Gato Fedorento.

In 2015, Marketing left Gato Fedorento after 7 years and Cristiano Ronaldo launches the new campaign for the MEO brand, a sub-division of Altice.

MEO ADSL integrates a router with a switch, connected to the telephone plug to decode and distribute the signal, and another for the television called MEOBox.

The IPTV network also enables the customer to play games in the MEOBox and to explore content from the internet and dozens of interactive apps.

MEO VideoClube is a video-on-demand service that offers a catalog of thousands of Portuguese and international programs (including movies, documentaries and concerts).

Additional features available include trailers, synopses, cast and IMDb rating; a favorites list; 48-hour viewing window; renting HD/3D movies with dolby surround sound; total control and privacy through a security PIN for “rentals and purchases” and a security PIN to access adult content.

In 2014, the services was refreshed with an improved image, faster navigation and new features with additional content and information, and a more accessible user experience.

MEO Go allows viewers to watch live TV and video on demand content on Windows, Mac and mobile devices such as tablets and smartphones via any 3G/4G broadband or WiFi internet connection.

IPTV technology allowed MEO to provide several interactive services, namely during the FIFA 2010 World Cup in South Africa.

In the strategy for portfolio diversification and new businesses, MEO Energia is launched, through PT Live, a partner of Altice Portugal, adding energy exclusively produced from 100% renewable sources and communication.

[14] On August 6, 2020, Altice Portugal informed the Competition Authority that it acquired PT Live and that it will change its name to MEO Energia.

MEO sponsored all the "Big Three" from the Primeira Liga (Benfica, Porto[16] and Sporting) from 2005 to 2015, when he sold for the rights with NOS.

It also sponsors athletes such as footballer CR7, Moto GP racer Miguel Oliveira, surfer Frederico Morais and World Surf League event MEO RCP Portugal.

A MEO advertisement for data access was the focus of a discussion beginning in October 2017 in Portugal, the European Union and the United States and relating to net neutrality.

On 26 October 2017, Democratic Party U.S. Representative Ro Khanna posted a screenshot of MEO's website to his Twitter feed while stating that their sales model was a violation of net neutrality.