Taiwan's government is drawing up advice for people traveling to China after new entry and exit rules kick in September 15, a warning sign for tech workers and business travelers.

• China's new entry-exit rules take effect September 15 and apply to foreigners, including Taiwanese.
• Engineers and business travelers have raised alarms with several government agencies about phone and laptop searches.
• The main fear is that company secrets or personal data could be taken during those checks.
• Officials say social media content on a phone could be used to pin accusations on a traveler.
• Some people already leave their own phones at home and carry company devices instead, and foreign firms are buying dedicated travel devices.

Outlook: Taiwan's China policy body and economics ministry plan to publish protective guidelines soon, and similar caution is spreading beyond Taiwanese travelers.