This is junk service. My experience in early 2016 was filled with bad service, unbelievable bad or non-existing communication and a non-working product. Be careful and don't deal with PREPAIDZERO.com!

Update: It's AMAZING. Prepaidzero could answer my review within 15 minutes - but was not able to respond for several times every time I had a support case. (In several occasions).

My answer: there is nothing how you guys can help me anymore. My two US trips have gone wrong already with your SIM card that was not activated and didn't get topped up as per your instructions. I had significant roaming costs because I relied on your product and couldn't use it for days. But this is already over. I am back home and don't need your services any more. And I can only repeat my warning: I cannot recommend at all dealing with this company:

Bad service! Bad communication and bad product. They don't know their own products, sell things in their onlineshops that they have to refund again later. Also they sell "international calling credit" without stating that this is only to be used for Voice-Over-IP-connections. (I don't mind, but it's not professional neither for to name the product "international call credit" without any further remarks in regards to voip-use-only).

2nd update:
This type of answer exactly states how PREPAIDZERO.COM operate. The whole spirit of the "company" (?) is shown how they try to talk themselves out of the situation. Just blame others and explain that everything was an exception. But this is not true: Both in February AND in March there were massive problems in the communication with their customer service. They only replied after a few days after several reminders. Of course they refunded the product for topping up the card. But first they advised that I should buy it, then they didn't answer and finally when I found out that it won't work, yes... they've refunded. All resulting in several days delays in using the card again. But this was just one little part of the WHOLE problem and their non-responsive and non-transparent way of working. Sure there is no intention to provide bad service or sell products that don't work. I am sure about it. But then the whole reselling-things just doesn't work. I can only repeat my experience: I will never work with this company again because I had a terrible experience - twice.