HTC, the maker of Sprint’s first 4G phone, beat its forecast for second-quarter sales, according to unaudited financial results reported today.

The handset maker saw sales of its predominantly Windows Mobile and Android devices rise nearly 37 percent over last year to $1.87 billion in the second quarter, beating its earlier forecast of $1.55 billion. Profits came in at $267.9 million, or 33 cents per share, compared with last year’s audited earnings of $201.7 million, or 25 cents per share.

HTC didn’t comment on its financial results except to say that they showed “good execution of brand strategy and grow scale strategy.”

HTC has a number of high-profile smartphones on the market, including the HTC Evo 4G with Sprint, the HD2 and Google’s Nexus One. Windows Mobile dominates HTC’s handset lineup but the company has aggressively expanded into Google’s Android operating system and recently launched a mid-tier device based on Qualcomm’s Brew MP technology.