yes .I received missed calling from 6889027267 ,many times with different number with same country code 688
Just a missed call from the number 688275260910
This is the second time or third time i have had a call with 688 but i dont know anyone with such code.
Countries close to Tuvalu are Nauru, Fiji, Vanuatu, Solomon Islands, Marshall Islands, New Caledonia, Norfolk Island, Micronesia and Papua New Guinea.