A great replacement android text messaging app for stock SMS text messenger. 
It's secure with upmost privacy protection. 
Best SMS app with ultimate message customization
Encrypted chat - Reliable guard to keep texts safe 
 Texting from any system/device with 'Anywhere'
 Cloud backup - never worry about long texts again
Built-in chatGPT support
 Lots of Stickers, emojis, and gifs to choose from
 Wear OS device support(Dependent on phone app)
 Group or mass text to send a message to multiple recipients
 Support for foldables, like Samsung fold
 Support for most android version (4.4 to 13) and Lineage OS 19
 Dual SIM support

Security
For every update, it'll be scanned with *VirualTotal* 60+ mainstream anti-virus engines to make sure it's safe. Protecting data privacy is our top priority.
Conversations now can be encrypted as per your need 

Messenger Customization
The theme store offers over 200 themes to choose from with new ones updated weekly.
You can personalize text messages, fonts, stickers, colors, ringtones, LED colors, vibration patterns, etc. 

Handcent Anywhere - best private texting on computer and tablet.
Cross-platform texting on all systems and devices, which is one and only on the market. Windows, Mac OS, Linux, iOS, android, computers, tablets, and smartwatches all have their own separate apps. You can send texts anywhere you are without the phone. 
Go to aw.handcent.com and start chatting & messaging. Group text is also supported
Wear OS
Receive and reply messages on all android-based smartwatches, along with the features like voice to text, etc.
Support Wear OS , Galaxy Watch series with Tizen and both square and round watches

Need to work with the phone app, doesn't work as a standalone app

MMS
MMS is fast and stable, can receive all kinds of MMS messages and also share full-size multimedia with MMS plus. 
Share multimedia messages with your friends. MMS plus can act as a multimedia android text messaging downloader, save multimedia files on our private cloud server.

Pop up text
Quick reply text messages within a pop up window.

Private Box
An encrypted text message box that can only be opened by unique passcode. All texts in private box can only be viewed by yourself. Best way to protect you while messaging & texting.

SMS Backup
Never worry about losing your texts or messages with our backup service. Restore all your private messages (SMS / MMS) and settings when you switch to a new phone or reset your phone.


Search
You can search text messages by time, message type and etc. 
All SMS messages with text are searchable 

SMS Blocker/Blacklisting
Block all unwanted or spam SMS & MMS messages in our private android text messaging app.

Spam filter
Automatically filter and block potential spam messages

Scheduled Task
Schedule texts & messages to be sent at a given time.

Emoji
You will love animated emojis that also comply with the newest emoji standard.

Stickers
Now integrated with Giphy. You can send messages with stickers by using quick search. Handcent is the best sms messenger with stickers.

Drive mode
To read texts or mute during drive to ensure driving safety with Android Auto support 

Text to Speech
Read texts out loud with support for repeated reminder  

Sticky on top
Handcent Next SMS messenger pins your private contacts on top based on your SMS & MMS needs.

Other messages improvements.
Built-in ChatGPT to let you talk to AI as a conversation thread
Group Messaging Chat: Create a group with friends/contacts, all contacts will receive the message while texting. Send mass text messages with stickers to all members of the group. You will love the simple group and mass SMS & MMS messaging.

Other free features: Bulk Mass SMS & MMS, group text, text snippets and etc. to improve your productivity

Customizable SMS text messenger with MMS, group message, sticker&amp;private texting