A:AnswerThese devices are made for use in the US. You will need to contact your carriers to see if this device is compatible with the bands that they offer.
A:AnswerHey, for more detailed information on how to remove this, you may want to reach out to Samsung Support here: https://www.samsung.com/us/support/.
A:AnswerThere is a space for an SD card so yes the memory is expandable. I plug it in overnight to charge so not sure when it is actually at 100%. I find that the battery lasts me 2 days before getting low but this could vary depending on your use. I am a Canadian Snowbird so have 1 SIM card for my Canadian carrier and 1 SIM for my US prepaid carrier. I love that I don't have to carry 2 phones and with roaming turned off I don't have to worry about extra fees. You can set it up to indicate which SIM you want to use when making phone calls etc.