I don't see any discussion yet regarding LycaMobile, so I figured like it says in Pirkei Avos "ובמקום שאין אנשים, השתדל להיות איש", I'll be the one.
LycaMobile is brand-new to the American market (they are the largest MVNO in Europe) and is currently offering the best rates on prepaid "pay-as-you-go" wireless service. (SIM cards are free.) They operate as an MVNO over the T-Mobile USA network. (Although, unlike most other T-Mobile MVNOs, you cannot use a handset locked to T-Mobile. It must be an unlocked GSM device.) I'm uncertain whether a LycaMobile line will roam unto AT&T or any other carrier for even voice service where there is no T-Mobile coverage.
Pay-as-you-go rates:
2¢ per minute for voice.
4¢ per text. [From what I understand all incoming texts are free.]
6¢ per MB for data.
Oddly they bill 2¢ per minute for incoming voicemails but do not bill anything (read:free) for checking your voicemails from your LycaMobile phone.
Amazingly, unlike any other American wireless carrier or MVNO that I am aware of, the LycaMobile pay-as-you-go refills/recharges never expire. You can add funds once and you'll keep your service active indefinitely even if you never add funds again! (So long as you still have any balance left.) The only requirement is that you use the service at least once every 120 days. So one one-minute call or text every four months will keep the account (and your phone number) active with no service charges.
Their pay-as-you-go rates seem to be the industry low. Especially for voice. I know of no other carrier offering 2¢ a minute rates with no expiration or minimums. It seems especially perfect for low-volume users (children, elderly, etc.)
They also offer very good unlimited plans:
$19 per month for unlimited voice and texts. 6¢ per MB of data.
$29 per month for unlimited voice, text, and data.
Are there any other providers offering similarly good rates?