HTC’s new line of One-series smartphones launched on April 2nd in Europe and parts of Asia, but HTC’s performance hasn’t yet caught up to the impressive earnings it managed last year. HTC reported six consecutive months of record revenue in 2011 before increased competition from Samsung and the launch of Apple’s iPhone 4S began a steep slide that continued last month. HTC on Monday announced that its consolidated revenue for the month of April totaled NT$31.03 billion, or approximately $1.06 billion. Performance improved for the second consecutive month, up from NT$30.88 in March, but sales were down 20% from NT$38.73 in April last year. HTC’s One S smartphone launched late last month on T-Mobile¬†and the flagship HTC One X became available from AT&T on Sunday.