The smartphone giant expects second-quarter operating profit to decline 4 percent and miss analysts' expectations.
Helio, which flamed out five years ago, is taking on the US wireless market with a new parent company and simple $29-a-month plan.
The PC maker recorded a net income of $100 million, beating analysts' expectations.
HTC says that its revenue was up 25 percent in the first quarter, but its forecasts are not encouraging.
Given Apple's guidance for the current quarter, Piper Jaffray analyst Gene Munster has boosted his prediction for iPhone sales.
Thanks to its "no device subsidy" model, AT&T says it lost fewer customers to rivals than it ever has in the first three months of the year.
The e-commerce pioneer's overall results hid the differing paths of eBay's two main businesses, with PayPal growing and eBay.com floundering.
Apple may have sold as many as 57 million iPhones last quarter, according to analyst Gene Munster. That would be a sharp jump from 43.7 million from a year ago. But would that make Wall Street happy?
A core component in the rumored next iPhone will be a new Qualcomm-developed LTE chip that doubles its maximum potential Web-connectivity speeds, according to a new report.
The video-streaming service adds 4.9 million new members in the first quarter, hitting milestones both in the US and in its international markets.