Possible Clues:

• Texting feature that sometimes goes awry, and what was used on 17-, 28-, and 46-Across?
• This mobile phone facility can create accidental comedy
• Cause of embarrassing typos, perhaps
• Amusing editor, at times
• Function that might make your dick sick?
• Smartphone texting feature, which usually detects and fixes the thing hidden in 17-, 24- and 47-Across
• Aid for clumsy thumbs