If you previously were able to make calls but currently have no service, it is likely that there is poor reception (network signal strength) in your specific location. If you are able, move to a different location and verify if other people on the same wireless carrier have service. If the issue persists, please power off the phone and power it back up.
Note: if the problem persists across multiple locations while confirming that other people have service on your wireless carrier, please call the wireless carrier customer service line from a different phone to confirm that your account is still active. If your line is indeed active, please call our friendly Hot Pepper Support Team at +1 855-737-7377 (+1 855-PEPPERS) and we'll be delighted to help you resolve this issue.