Generally, you need a special guitar adapter to connect your guitar to an iPhone or iPad. The adapter turns guitar sound into data that can be read by your iOS device.
Tonebridge compatible devices:
• iRig, iRig 2, iRig HD, iRig HD 2, iRig Pro
• Ampkit Link
• Apogee JAM, Line 6 Mobile In, Line 6 SonicPort, iRiffPort, Alesis IO Dock
• Rocksmith cable (with Apple camera adapter only)
• Jamstack amp
To know more, see a detailed step-by-step tutorial we've created.