Through the SafeLink wireless website, www.safelinkwireless.com, you are able to check your pending SMS messages and minutes. You can buy top ups for your SafeLink cell online as well. There is also a service online for enabling voicemail on your SafeLink cell if this would make it easier for you to keep track of who is calling you. Simply go to the website and click on the "check status” tab to see how many minutes and texts you have.
You could try ringing SafeLink with this query as they may be able to trace your call history through their system. The technical support number for SafeLink cell phones is 1 800 378 1684. They recommend, however, that you do not call this number with your SafeLink cell, because it will use up your allowance of minutes. Instead, they recommend that you use a landline wherever possible because the call form a landline is free or considerably cheaper than it would be on your cell.
SafeLink services cover the whole of North America and provide free mobile phones and minutes for those with low incomes. They provide calling, texting, voicemail and 411 directory help services for those that do not have a very high income. You can also make long distance calls and users of the service all get free 911 calling abilities.