What was the increase in the number of subscribers that sign-up for VPN secure revenue contributions from enterprise customers in the fourth quarter of 2020 compared to the same quarter in the previous year
 enterprise private network for semiconductor industry, which launched in -- during the fourth quarter, marking another milestone of our efforts to develop 5G smart manufacturing. We intended to leverage the government's 5G subsidies to substantially accelerate 5G network construction from five years to three years, which we will elaborate later on. Now I will provide key highlights from the fourth quarter of 2020. For our broadband business, we are pleased to see continued ARPU uplift as a result of ongoing increase in higher price plan adoption. Subscriber migration to our broadband of 300 megabits per second or higher continue to increase by approximately 69% year-over-year, contributing to year-over-year broadband revenue growth for the 11 months in a row.
The number of home Wi-Fi devices also increased 373% year-over-year. Now allow me to walk you through each of our business lines. Turning to slide five, you can see an update of our mobile services business. In the fourth quarter of 2020, we continue to maintain our leading position in the mobile market as the subscriber market share, excluding IoT SIMs, reached to a 36% and the revenue market share increased to 38.4%. We are pleased to see our post payment subscriber net adds maintained positive for four consecutive quarters. Marking a whole year, attributable to effective 4G subscriber retention and 5G migration, which we believe will continue to support our mobile business in a healthy trajectory. We have seen a upset in 4G -- our 5G continued to enhance the contribution of higher price plans. And we aim to accumulate two million 5G subscribers this year. We remain optimistic about our mobile performance and multi development in 2021. Please turn to slide six for an update on our broadband business in the fourth quarter.
During the quarter, our broadband ARPU increased by 3% year-over-year, which reflects our success in migrating subscribers to adopt higher speed services and other benefits from stay-at-home opportunities in the new normal. The number of subscribers that sign-up for connection space of 300 megabits per second or higher increased by 69% year-over-year, while VPN secure revenue contributions from enterprise customers grew as well. Thus, we are confident that we will maintain the overall upward trend in our broadband business despite the ongoing decline in the number of low-speed subscribers quarter-over-quarter. Going forward, we will focus on developing data-driven subscription enhancement, home-centric application and high speed migration to expand our household and market share.
Slide seven demonstrates our MOD business performance. In the fourth quarter of 2020, our MOD/IPTV platform continued to be the largest video platform in Taiwan. And our business remained relatively resilient under the headwind of COVID-19 pandemic, which today major -- and sporting events and movie releases. Subscription momentum decelerated as a result. However, MOD ARPU slightly increased quarter-over-quarter as subscribers of OTT services such as Netflix continue to grow. In addition, we continue to see upsell in our tiered price channel packages and digital convergence packages. Going forward, we will continue to differentiate our products by enriching 4K content as well as AI and VR services, along with the oriented games, which had been delayed and is expected to take place in 2021. We also plan to enhance revenue by promoting core sales on the platform to further enhance ARPU. Please turn to slide eight for an update on our ICT business.
Overall ICT project revenue increased by 49.9% year-over-year in the fourth quarter due to revenue recognition of large government ICT projects. Our emerging ICT service revenues increased year-over-year as well. IDC revenue increased by a 75.6% year-over-year due to the completion of large projects. Cloud revenue increased 28.6% year-over-year as we see the revenue increase in both projects and international public cloud services. Cybersecurity revenue increased 23.8% year-over-year, with a significant contribution from financi
 enterprise private network for semiconductor industry, which launched in -- during the fourth quarter, marking another milestone of our efforts to develop 5G smart manufacturing. We intended to leverage the government's 5G subsidies to substantially accelerate 5G network construction from five years to three years, which we will elaborate later on. Now I will provide key highlights from the fourth quarter of 2020. For our broadband business, we are pleased to see continued ARPU uplift as a result of ongoing increase in higher price plan adoption. Subscriber migration to our broadband of 300 megabits per second or higher continue to increase by approximately 69% year-over-year, contributing to year-over-year broadband revenue growth for the 11 months in a row.
The number of home Wi-Fi devices also increased 373% year-over-year. Now allow me to walk you through each of our business lines. Turning to slide five, you can see an update of our mobile services business. In the fourth quarter of 2020, we continue to maintain our leading position in the mobile market as the subscriber market share, excluding IoT SIMs, reached to a 36% and the revenue market share increased to 38.4%. We are pleased to see our post payment subscriber net adds maintained positive for four consecutive quarters. Marking a whole year, attributable to effective 4G subscriber retention and 5G migration, which we believe will continue to support our mobile business in a healthy trajectory. We have seen a upset in 4G -- our 5G continued to enhance the contribution of higher price plans. And we aim to accumulate two million 5G subscribers this year. We remain optimistic about our mobile performance and multi development in 2021. Please turn to slide six for an update on our broadband business in the fourth quarter.
During the quarter, our broadband ARPU increased by 3% year-over-year, which reflects our success in migrating subscribers to adopt higher speed services and other benefits from stay-at-home opportunities in the new normal. The number of subscribers that sign-up for connection space of 300 megabits per second or higher increased by 69% year-over-year, while VPN secure revenue contributions from enterprise customers grew as well. Thus, we are confident that we will maintain the overall upward trend in our broadband business despite the ongoing decline in the number of low-speed subscribers quarter-over-quarter. Going forward, we will focus on developing data-driven subscription enhancement, home-centric application and high speed migration to expand our household and market share.
 Slide seven demonstrates our MOD business performance. In the fourth quarter of 2020, our MOD/IPTV platform continued to be the largest video platform in Taiwan. And our business remained relatively resilient under the headwind of COVID-19 pandemic, which today major -- and sporting events and movie releases. Subscription momentum decelerated as a result. However, MOD ARPU slightly increased quarter-over-quarter as subscribers of OTT services such as Netflix continue to grow. In addition, we continue to see upsell in our tiered price channel packages and digital convergence packages. Going forward, we will continue to differentiate our products by enriching 4K content as well as AI and VR services, along with the oriented games, which had been delayed and is expected to take place in 2021. We also plan to enhance revenue by promoting core sales on the platform to further enhance ARPU. Please turn to slide eight for an update on our ICT business.
Overall ICT project revenue increased by 49.9% year-over-year in the fourth quarter due to revenue recognition of large government ICT projects. Our emerging ICT service revenues increased year-over-year as well. IDC revenue increased by a 75.6% year-over-year due to the completion of large projects. Cloud revenue increased 28.6% year-over-year as we see the revenue increase in both projects and international public cloud services. Cybersecurity revenue increased 23.8% year-over-year, with a significant contribution from financi