Welcome to Android Central! An ISP is an Internet Service Provider, which is a company that provides internet service to your house. They usually aren't your wireless mobile phone carrier as well (although in some cases they will bundle it, like Xfinity in the US). So do you mean your wireless carrier sent you a new SIM card?
Do you still have your previous phone, or did you get a new phone? If you still have your previous phone and it's still supported by your carrier, then you should be able to swap the old SIM card with the new one. Your data will remain unchanged on your phone.
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