When you call for a taxi remember to inform the service assistant of the number of people travelling, where you want to be picked up, where you are going to, and whether you have a lot of luggage. Remember also to inform the taxi operator if you are travelling with children which require a special child seat. Some taxi operators will allow you travel with your dog in certain taxis, so remember to inform the taxi company if you have a dog with you. You should also inform the company if you need a taxi that you can access with wheelchair, or you are bringing a stroller.
Many taxi service companies have an MSN service which lets you know when the taxi has arrived.
Some taxi companies enable frequent users to have a taxi turn out at a specific location on demand. If you are frequent user of taxis you should ask the taxi company if it offers such services.