Most people today use mobile phones. Our research is looking at using a mobile phone app to help with diabetes care in pregnancy. In particular, the investigators are using phones which connect to the standard blood glucose monitoring machines given to all women with gestational diabetes to see if sending the hospital team blood test results between clinic appointments can result in the need for fewer clinic visits. The investigators are also testing to see how acceptable using mobile phones in this way, is to our patients and that the control of the blood glucose and outcomes for the mother and baby are at least as good as standard care.