In the OPPO A series, you can find OPPO's entry-level smartphones. The higher the number behind the A, the better the device performs. So, the OPPO A94, A74, and A54 are good mid-range smartphones. These devices have relatively good cameras at a great price. You can also connect to the fast 5G network. All A models have at least a 6.4-inch screen and a long battery life. You can buy smartphones from the OPPO A series as a separate device at Coolblue. The mobile phones are SIM free, so it doesn't matter which provider you have a phone plan at.