While it's true that getting a new local SIM card is less convenient, I would definitely switch to a different one if I were traveling or on business in a foreign location where I needed to stay connected.
Secondly, on September 7th, I went to the scenic area to climb a mountain with an altitude of 1736 meters. I contacted several local and distant DX stations in Luanping County, Hebei Province, which is about 400 kilometers away from Beijing, and this "changing cards" was very useful.
Of course, you can also exchange eyeball cards offline, which means exchanging cards with fellow ham radio enthusiasts in person.
For amateur radio operators, exchanging cards is very important because it records communication and also has a collectible value, which is considered a high level of etiquette.
Finally, let me emphasize one key point: If you are preparing to take the B license exam, be sure to frequently exchange your cards. You must upload records of communication and photos of activities such as exchanging cards as part of the exam eligibility requirements.
A qualified ham radio operator should definitely have their own QSL card.
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