At that time, Philips was an internationally famous brand, and so was the mobile phone. But later, Philips' mobile phone business was sold to China Electronic Information Industry Company (CEC), so this piece of Philips mobile phone was made in China, so the brand of the mobile phone was Philips. Although there are domestic components, Philips' mobile phone inherits the unique characteristics of long standby and its own operating system, which is well-known in China. General business people will choose Philips mobile phones if they have a lot of call services, and the appearance of Philips mobile phones does not pursue beauty, which is absolutely commercial and convenient. I suggest your dad continue to use it, no problem. My classmate's 9@9i has been used for 3 years without any problems.
Philips' long standby is different from the cottage promoted by TV and stores. Philips mainly developed a set of power-saving devices on the motherboard, but Shanzhai simply increased the battery capacity, ignoring the harm to the human body if the battery exploded.
Don't worry about its quality. If it works, use it. If it doesn't work, change to another mobile phone, but don't change Samsung or LG for your father. The waiting time is not very good.