There are mobile phones in all shapes and sizes. If you only want to make calls and send text messages with your new phone, you don't have to buy a device with a large screen or a fast processor. Mobile phones with a small screen have the advantage that the battery often lasts longer. Most mobile phones also have large, physical buttons. That makes the controls a lot easier. You're less likely to misclick, for example. A flip phone takes up less space. Open the phone to answer and close it again to hang up. All our mobile phones are SIM free. You can use your device in combination with a phone plan by any provider.