Can I make a phone call to Hong Kong without roaming? Mine is Jiangmen mobile card.

If you don't roam, there will be no signal on your mobile phone at customs clearance, and you can't make a phone call without receiving information, so of course you won't go out. Jiangmen belongs to Guangdong, and Hong Kong and Macao Day packages can be opened. Answering in Hong Kong is free, and outgoing calls are cheap. Of course, it is more convenient to buy a Hong Kong mobile phone card, with 7 days of unlimited internet access and 80 minutes of long-distance calls from the mainland.

I hope I can help you ~ Please feel free to ask any questions ~