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step 1: go to settings->cellular->sim applications
3g,4g
JP DoCoMo
failed (initial setup) no signal

Step 2: once you're on initial setup (white screen)
Step 3: press home button then emergency call and diall *5005*7672*00#
Step 4: select *6S, 6SP
Step 5: softbank
success (initial setup) with signal