I have rented from Budget the 2 times I have been there. The last time I ended up with a car that had low air pressure in a couple of tires and an AC that was very poor. They pointed out the AC problem but had no other cars to offer. It turned out that it worked marginally enough to use for the week. At the time I was working and had used Budget because the company I worked for got a discount. Probably wouldn't use them again in Aruba.
Also had a company Blackberry that paid the international rate so can't help you on a phone recommendation.