You have nothing to lose by trying them out for a month. There’s no contract and you can leave them at anytime. You just need an unlocked gsm phone. (They give you a free SIM card.) If you have an old unlocked at&t or t-mobile phone, that’l work. Otherwise you can buy a cheap unlocked gsm phone for $20 or $30 or so. If you want, you can even port your phone number to google voice, instead of to lyca, and forward the number from google voice to your newly issue loycamobile number.
So your only cost to lycamobile would be $10 for dirt-cheap cell service.