The stores, which contributed just over 1 percent to the company's overall revenue and 1 percent to its overall square footage, will be shut effective May 31.
Earnings, adjusted for one-time gains and costs, were $2.42 per share, blowing past the per-share projections from analysts of $2.05, according to Zacks Investment Research.
Best Buy began opening the dedicated mobile phone outlets about 10 years ago, before the first iPhone was released.
Online sales jumped 17.9 percent in the USA from a year ago, accounting for $2.8 billion of business in the quarter, or about 20 percent of Best Buy's total revenue.
Looking ahead to FY19, Best Buy is expecting comparable sales to come in between flat and 2 percent growth on top of the 5.8 percent growth delivered in FY18.
On Wednesday, the company said it would shut 250 small mobile phone stores in USA malls as it looked for ways to operate more profitably and turn around its business amid intense competition.
Revenues rose 14.0% from a year ago to $15.36 billion, compared with analysts' view for $14.52 billion.
The consumer electronics retailer posted revenue of $15.36 billion in the period, also beating Street forecasts. It is also quite possible that mobile retail margins are dipping and the business, in general, is not as profitable as it once used to be.
Since that time, the company attempted to turn around through closing stores that underperformed, improve customer service, and compete with online giant Amazon.com through matching the low prices of the e-commerce behemoth. It plans a new app feature so customers can tell the store when they're on their way to pick up some items.
Best Buy wouldn't say how many employees would be affected by the move, but the letter said it will help them find other jobs within the company over the next three months. For the year, online sales generated $6 billion.