Lycamobile is a MVNO of T-Mobile, Lyca use the same signal tower as T-Mobile. Works with T-Mobile phones or GSM unlocked phone. Your Unlimited Cell Plan gives you: Unlimited Nationwide Talk, Text and Data. First 500MB Data at up to 4G LTE and then unlimited 2G speed. Unlimited(first 10 unique number) international calling from the USA to China, India, Poland, Mexico, South Korea, Thailand plus 30 other countries. Unlimited no cost calls to Lycamobile numbers worldwide.These SIMs are intended for new Lycamobile customers only and Lycamobile to Lycamobile porting is not allowed and may render the SIM void.