collecting the tariffs for fixed-to-mobile calls from mobile service providers to fixed communications service providers since January  1, 2011, which gave our fixed communications business the right to set and collect the tariffs for fixed line-to-mobile phone calls. Mobile services.  Revenues from our mobile services comprised 36.1% and 32.6% of our revenues in 2010 and 2011,  respectively. Revenues from our mobile services decreased by 3% from NT$73.1 billion in 2010 to NT$70.9 billion (US$2.3 billion)  in 2011 due to the decline of mobile voice revenue as a result of the change in policy for collecting the tariffs for fixed line-to-mobile  phone calls from mobile service providers to fixed communications service providers, and the mandatory tariff reduction, which was  partially offset by the growth of mobile VAS revenue from NT$ 11.1 billion in 2010 to NT$15.2 billion (US$0.5 billion) in 2011.  Sales of mobile handsets and data cards.  Revenues from our sales of mobile handsets and data cards comprised 7.9% and  10.1% of our revenues in 2010 and 2011, respectively. Revenues from our sales of mobile handsets and data cards increased by  38.4% from NT$15.9 billion in 2010 NT$22.0 billion (US$0.7 billion) in 2011. This increase was principally due to the strong sales  of mobile smart phones and the general recovery of the economy in the R.O.C.  Internet revenues comprised 12.1% and 11.4% of our revenues in 2010 and 2011, respectively. Our revenues attributable to  our internet business increased by 1.4 % from NT$24.5 billion in 2010 to NT$24.8 billion (US$0.8 billion) in 2011. The increase was  mainly due to a 3% increase in the number of our total HiNet broadband subscribers from approximately 3.6 million as of December  31, 2010 to approximately 3.7 million as of December 31, 2011. Our HiNet subscribers remained at approximately 4.1 and 4.2  million subscribers as of December 31, 2010 and 2011, respectively. As of December 31, 2011, approximately 82% of our broadband  access customers were also HiNet subscribers, using HiNet as their ISP.  International fixed communications revenues comprised 7.7% and 7.0% of our revenues in 2010 and 2011, respectively. Our  international fixed communications revenues decreased by 2% from NT$15.5 billion in 2010 to NT$15.2 billion (US$0.5 billion) in  2011. This decrease was mainly due to the decrease in international long distance service revenue as a result of intensified market  competition.  International long distance telephone services.  Our international long distance telephone revenues decreased by 3.4% from  NT$12.9 billion in 2010 to NT$12.4 billion (US$0.4 billion) in 2011 because of the decline in traffic volumes as a result of intensified  market competition.  International leased line and international data services.  Our international leased line and international data revenues  increased by 6% from NT$2.0 billion in 2010 to NT$2.1 billion (US$70.1 million) in 2011. The increase was mainly because of the  overseas market expansion and the increased demand of multinational corporations.  Other revenues comprised 1.3% and 2.3% of our revenues in 2010 and 2011, respectively. Our other revenues increased by  90.0% from NT$2.7 billion in 2010 to NT$5.1 billion (US$0.2 billion) in 2011. The increase was mainly due to higher property sales  by our subsidiary Light Era Development Co., Ltd. Our operating costs and expenses increased by 12.0% from NT$145.0 billion in 2010 to NT$162.4 billion (US$5.4 billion) in  2011. This increase was primarily due to the higher cost of handsets sold, interconnection costs and transition fees resulting from the  change in policy for collecting the tariffs of fixed line-to-mobile phone calls.  77 Internet  International fixed communications  Others  Operating Costs and Expenses  P AR T I