首先要明确一个概念：无数据手机计划。
只能接/打语音电话，接/发短信。不能上网 （自然也就不能使用一切需要网络的应用程序，比如微信。必须有 WIFI，才可以使用一切需要网络的应用程序）
TextNow 现在就有一个这样的计划。需要自带手机，并花1美元买它家的 SIM卡。在它家网页注册账号，挑一个电话号码。你就有了这个无数据手机计划。目前这个计划无月费，免费。
当然它家计划不止这一个，如果想研究其他计划，可以参考它家的网页。https://www.textnow.com/
当然，商家要赚钱才能生存。它家的赚钱方法之一，就是给你的手机发广告。所以如果对广告很反感，这个免费计划就不适合你。
2月22日收到 SIM 卡。按要求激活后仍然不能在无 WIFI 下接/打电话。经在线客服指点，要设置 APN， 方法如下：
- Go to the Settings menu
- Click on Connections (it may also be called Networks or Networks & Internet)
- Click on Mobile Networks (it may also be called SIMs)
- Select Access Point Names (you may need to scroll down and tap on Advanced then select Access Point Names)
- At the top of the Screen, select Add (or +)
- Under Name add "TextNow"
- Under APN add "textnow.static"
- Tap the 3 dots in the top right and select Save
- Select the "TextNow" APN option
- Go back to the Settings menu
- Turn Airplane mode on and wait 10 seconds then turn it off again
- If the data is not working yet after toggling Airplane Mode, try restarting your device.
一般情况可以搞定。万一还不行，请试试如下设置：
In rare cases you may need to set more than just the APN name in order for data to work. This is very uncommon, but if you do need to we've listed them below. You will need to delete the current TextNow APN and re-add it with the details above and the information below:
- MCC: 310
- IP Protocol: IPv4
- MVNO Type : GID
- MNVO Value: 4358
