To check your mobile balance data , the process typically involves using USSD codes, sending SMS messages with specific keywords to your service provider's designated number, using official mobile apps provided by your service provider, accessing online account portals, or reaching out to customer service. Dialing USSD codes such as "*#123#" or sending texts with keywords like "BAL" to a specific number are common methods. Mobile apps and online portals allow you to not only check data balance but also manage other account-related activities. It's recommended to consult your service provider's guidelines for accurate instructions based on your location and provider.