Go to the Tru website: truphone.com and get the customer service number and ask them about expiration. Those who have asked have not gotten the clearest answers. My best understanding is that there is no expiration, but you need to make a paid use [send/receive call or send SMS] evert 60 or 90 days or a $3 a month charge will start. Please tell us what they say. At this point, no one else seems to have a 'no expiration' phone. Tru uses both T-Mobile and AT&T [as of last week] for their US networks. $30 gets the SIM delivered to you in the US and $15 credit. Sending SMS is twelve cents. Calling in the US is 17 cents a minute billed [30/1] 30 second minimum and then by the second. If you search this forum for Truphone and Tru you will see what people think. Mostly positive. Understand this: With a US SIM you have 'membership rates' for the US with the SIM--no additional monthly charges. The only benefit of membership rates is if you are in other Tru countries--right now only UK and Austrailia.