When data allowance will be added? Customer Support December 04, 2018 09:13 Updated Follow Data allowance will be allocated on the first of each month. Related articles What happens if I do not use all of my data allowance. Will the unused data allowance be carried over? What is a Data allowance ? How do I check my data usage? How do I check my bill? Can I use internet outside Japan / in my home country? Comments 0 comments Please sign in to leave a comment.