As for the new phone, it's just that it's a bit more expensive;
When it comes to used equipment, the best option for long-term personal use is to buy a newer version. The 718 was released in the early 21st century, so older models are likely at least 10 years old. Electronic components and circuit boards will gradually age with use, leading to increased heat generation.
Regardless of the version, before purchasing, make sure it's a functional machine, that the power supply is normal, and that it can output power correctly. Also, check for any issues with frequency deviation.
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