Changing the SIM card will not harm the software. However, you should make sure that your child's or employee's new SIM card has unrestricted GPRS internet and the internet connection is working properly. You can check this by opening the phone's web browser and try going to http://www.mobile-spy.com. If you see the site, then the Internet settings are fine. If not you will need to enable the Internet through your carrier or adjust the Internet settings of the phone to utilize the new carrier or data plan.
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