Phone weighing 200 grams doesn't really feel heavy. I would say that 200 grams is an average weight for a mobile phone.
200 grams is a common weight for phones with 6.5 inch or larger screens. For example, Samsung S24+, Samsung A25 or iPhone 15 Plus have a weight around 200 grams.
250 grams is 25% more than 200 grams, so you can feel the difference. Phones weighing 250 does feel a bit heavy. For example, Samsung Z Fold5 is a phone with large screen and it does feel heavier than an average phone.