An analyst firm questioned the sales performance of LG Electronics due to doubts over the performance of its handset unit, shortly after the company saw its mobile business return to the black on the back of smartphone growth, Bloomberg reported.

According to an analyst with Mirae Asset Securities, the handset maker is counting on LTE devices to power its growth, with several devices supporting this technology announced at the GSMA Mobile World Congress last month. However, Lee Soon Hak said that “market expectations of the company’s LTE phone sales need to be lowered,” citing weak demand in North America.

While LG lost its number three position in the handset market to Apple, with aggressive Chinese vendor ZTE close behind, the company’s mobile unit recently moved into profit after a prolonged period of losses.  At this time it cited “strong premium smartphone sales from the Optimus LTE and solid sales growth from existing smartphone models.”

The company has said that its emphasis moving forward is on smartphones, “especially on LTE."