We are designing a pipeline that will take phased data as input. We will ultimately be using a phased dataset provided by another group. Until this arrives we would like to practice with some phased data. We have data in VCF files that we would like to have with phase information. So output should also be VCF format. Can anyone recommend a fast way to get phase information from, and ultimately in, VCF format. Here the emphasis is on speed, we want phased data as fast as possible as dummy data and are not concerned with error rate (this once). Thank you in advance for your comments.