T-Mobile is offering their Simple Starter Plan, which includes unlimited talk and text and up to 500MB of 4G LTE data, for $40 per month or 2GB of 4G LTE data for $45 per month. This is a no-contract plan and will not incur any data overage fees. Once your data allotment is reached, you can choose to pay for more data or wait for the next billing cycle when it rests.