Very Cheap Iphone 5s Unlocked there. Yuntab Octa Core 5 Inch 3g Unlocked Cell Phone more. Full SIM - 85mm x 53mm Mini SIM - 25mm x 15mm Micro SIM - 15mm x 12mm Nano SIM - 12.3mm x 8.8mm Built-in SIM - 6mm x 5mm If you have an iPhone 5 or 5 new, your mobile phone uses a nano- sim. So, if you say an iPhone on the Verizon network, it needs a SIM card so Verizon knows that the phone belongs to you and that you pay for the subscription, but as sure the features will work. Due to the gravity differences, this is not possible if you are on Nano SIM (a nano SIM card that you cut off will be a bit too thick and has the potential to be captured in nano SIM. This means that although a SIM- Card from a carrier works in all devices sold by the same carrier, it does not work in a device sold by another carrier, whether you buy a used phone or a buyer from a friend or SIM-free from a retailer to choose, make sure you get the correct card. If you travel to Europe or most Asian countries and want to use a mobile phone but also want to avoid roaming charges, the GSM standard makes it easy to buy a phone that works, but there are some things you can do. Buying a prepaid SIM card for a country you visit prevents you from paying international roaming charges to the U.S. mobile service providers, which may be significant (more about it in one). The important part is a small integrated chip that can be read by the mobile device and contains a unique identification number, phone number and other data specific to the registered user. You can use a Triband 850 -1800-1900 unlocked mobile phone in Europe, but you will provide coverage in the 900 band, which is the most common band for international mobile phone communication. Advantages: - Data packet was large (9GB) - Good signal in Sydney and Melbourne - cheapest alternative we could find on the internet Disadvantages: - Signal was a bit weaker in remote locations. We will probably try the Wi-Fi trip from them next time.