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How to use OR with QueryExpression

I'm trying to get records that are filtered according to the same field (activitycategory) but different values, when I add more than one condition on the same value I get zero results, this is my code,is there a way to filter according to multiple fields or should I run a new query for each condition:

QueryExpression query = new QueryExpression("phonecall");
            query.Criteria.AddCondition(new  **ConditionExpression("activitycategory", ConditionOperator.Equal, GetConfigByKey("Marketing")));**
            **//query.Criteria.AddCondition(new ConditionExpression("activitycategory", ConditionOperator.Equal, GetConfigByKey("Fun")));**
            **//query.Criteria.AddCondition(new ConditionExpression("activitycategory", ConditionOperator.Equal, GetConfigByKey("Important")));** 
             query.Criteria.AddCondition(new ConditionExpression("statecode", ConditionOperator.Equal, 0));
            query.ColumnSet = new ColumnSet("statecode");
            LinkEntity transmitLink = new LinkEntity("phonecall", "transmit", "regardingobjectid", "transmitid", JoinOperator.Inner);
            transmitLink .LinkCriteria.AddCondition(new ConditionExpression("transmitstatus", ConditionOperator.Equal, 1));
            transmitLink .EntityAlias = "phonecall";
            query.LinkEntities.Add(transmitLink );
            EntityCollection allPhonecalls  = new EntityCollection();

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