Like in China, there are several phone service carriers for you to choose from in the United States. You can consult your mentors, who have been at CSU for a while which phone service and plan would best fit your needs. You can also ask them if they have a family plan you can join. Joining a family plan is usually cheaper than individual plan. Some students and scholars will choose to bring the unlocked phone to the US, so they can insert a US SIM card to use; while others may choose a local phone service and buy a new phone and plan together.