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.
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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.