keyNumber keys5.Function key, end call key, power key6.Back cover opening slot11.Loudspeaker12.To unlock the keys, select Unlock > *.Avoid touching the antenna area while the antenna is in use. Contact with antennasaffects the communication quality and may reduce battery life due to higher powerlevel during operation.Do not connect to products that create an output signal, as this may damage thedevice. Do not connect any voltage source to the audio connector. If you connect anexternal device or headset, other than those approved for use with this device, tothe audio connector, pay special attention to volume levels.Parts of the device are magnetic. Metallic materials may be attracted to the device.Do not place credit cards or other magnetic storage media near the device, becauseinfo stored on them may be erased.Some of the accessories mentioned in this user guide, such as charger, headset, ordata cable, may be sold separately.Set up and switch on your phoneLearn how to insert the SIM card, memory card, and battery, and how to switch onyour phone.MICRO SIMImportant: This device is designed to be used with a micro SIM card (see figure)only. Use of incompatible SIM cards may damage the card or the device, and maycorrupt data stored on the card. Please consult your mobile operator for the use ofa SIM card that has a nano-UICC cutout.Nokia 3310 4G User Guide© 2018 HMD Global Oy. All rights reserved. 6