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You will need to check the manual for the answering machine.
But if it's voicemail you need to change you will need to contact Tmobile support to do it.
This can also be changed in the voicemail settings but that is gonna be pretty tough to do if you don't speak Spanish.
If you want to try and do it yourself, you can dial 123 from your device to access your voicemail box. After you messages have played (if you have any) press 4 and then press 7 for English.