In that case why don't you shift to vodafone? Vodafone's pre-paid services are good, and now, they have launched new plans for internet too! I too use vodafone, but it's a post-paid connection. And customer support at vodafone are really good! Using it since 5 years. Go to people --> settings (select it from the bottom where 3 dots would be appearing). Then select filter my contact list, and then make sure hotmail is selected.