When contacting suppliers, especially in regions like Zhejiang, it's important to verify their authenticity and product quality. From my experience, using WeChat and WhatsApp has facilitated smooth communication and allowed me to negotiate better prices and delivery terms. Make sure to prepare specific questions about product specifications and company certifications before reaching out. This helps ensure you get exactly what you need. Also, requesting samples can be a useful step to assess product quality firsthand. Building a trusting relationship with your supplier can lead to more favorable deals and reliable sourcing in the long term. I found that clear and frequent communication avoids misunderstandings and speeds up the transaction process.