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Hi there! You can use the iPHone with the $35 plan. SIM cards may not be shared between two devices. Each SIM card is assigned to a device and paired together. You may not simply pop a SIM card out of one device and use it immediately in another device. What's the model of the iPhone that you are trying to activate?
Yes, you will need to get a new SIM card, and you will be able to transfer your service. You can visit your nearest Boost Mobile store to purchase a compatible SIM card, or we can send a free SIM card, and it may take from 3 to 5 business days to be delivered.