Apple 7 Plus is a mobile phone that supports multiple frequency bands around the world. Theoretically, there is no problem in using it in Singapore. The network standard adopted by Singapore is GSM, while the network standards supported by Apple 7 Plus include GSM, CDMA, HSPA, EVDO and LTE. Therefore, you can safely use the Apple 7 Plus mobile phone in Singapore. However, it should be noted that you also need to ensure that the mobile phone is unlocked, and choose a suitable operator or SIM card for normal use. If you have bought an unlocked mobile phone, you can contact the mobile phone manufacturer or operator to unlock it.