Question :

Is it possible to (quickly) switch the language of the spelling check while I’m writing a message on my iPhone ?

Answer :

Yes !

It’s really simple :

1- make sure you have installed multiple languages / multiple keyboards on your iPhone or iPad : Go to Settings –> General –> Keyboard –> (International) Keyboards –> Add New Keyboard…

…and select your desired languages from the list (then exit the Settings-app)

2- you have now installed not only the keyboard for each language, but also the spelling check… and it’s now available in any text or message you type (including SMS)

3- to switch the language of the spelling check, just tap on the globe-key next to the space-bar : when tap it, the space-bar will (only for a quick second) display the name of the keyboard you’re using… but… the language of the active keyboard layout is also the language of the active spelling check…

😉