Can I make a phone call when I travel abroad by mobile phone?

taking Unicom number as an example, after confirming the opening of international long-distance and roaming functions, Dialing method during outbound roaming:

1. Dialing back to the mainland:

1. Dialing mobile phone: +86 mobile phone number example: +86186XXXXXXXX

2. Dialing fixed line: +86 area code phone number example: +861XXXXXXXX(1 is Beijing area code)

2. Dialing other countries and regions: <