Yes, it is possible to send text messages over Wi-Fi without cellular service. In fact, Wi-Fi messaging is becoming increasingly popular as a way to communicate without relying on a traditional phone plan. There are a few different ways to send text messages over Wi-Fi, including using messaging apps, email, and Wi-Fi calling.

Messaging Apps:
One of the easiest and most popular ways to send text messages over Wi-Fi is to use messaging apps such as WhatsApp, Signal, Telegram, or Facebook Messenger. These apps allow you to send and receive text messages, voice messages, photos, and videos, and even make voice and video calls using an internet connection. You can use these apps on any Wi-Fi-enabled device, including smartphones, tablets, and laptops.
To use a messaging app, you need to download it from the app store, create an account, and then add your contacts. Once you have done this, you can start sending and receiving messages over Wi-Fi. The advantage of using messaging apps is that they are free to use, and you can communicate with anyone in the world as long as they also have the app installed on their device.
Email:
Another way to send text messages over Wi-Fi is to use email. Most smartphones come with an email app built-in, and you can also access your email from a computer or tablet. To send a text message using email, you simply compose an email and send it to the recipient’s phone number followed by the domain name of their carrier.
For example, if the recipient’s phone number is 123-456-7890, and their carrier is AT&T, you would send the email to 1234567890@txt.att.net. The recipient will receive the email as a text message on their phone. You can also receive text messages on your email by giving out your phone number followed by your carrier’s domain name.
Wi-Fi Calling:
Wi-Fi calling is a feature that allows you to make and receive phone calls over Wi-Fi instead of a cellular network. This is a great option if you don’t have cellular service but have access to Wi-Fi. To use Wi-Fi calling, you need to have a phone that supports the feature and have it enabled in your settings.
When you make a call over Wi-Fi, the call is routed through the internet instead of the cellular network. This means that you can make calls even if you have poor cellular reception, as long as you have a strong Wi-Fi connection. Wi-Fi calling also allows you to make international calls at a lower cost than traditional phone plans.
Final Thoughts:
In conclusion, sending text messages over Wi-Fi without service is possible and becoming more popular. You can use messaging apps, email, or Wi-Fi calling to send and receive messages and make phone calls. The advantage of using these methods is that they are free or cheaper than traditional phone plans and can be used anywhere in the world as long as you have access to Wi-Fi. The downside is that you need an internet connection, which may not be available in some areas.