Here are the APN settings for AIS 12Call for 3G and 4G including 2100 Mhz:

Name	AIS Internet
APN	Internet
User name	not set
Password	not set
MMC	520
MNC	01
APN type	Default or internet
Authentication Type	CHAP

For MMS:

MMSC	Http://mms.mobilelife.co.th
MMS Proxy	203.170.229.34
Port MMS	8080
MCC	–
MNC	-
authentication Type	–
APN Type	default

To check the instructions for your model of phone you can visit: AIS 3G Settings To set for Android: Settings

1. Wireless and Network (More)
2. Mobile Networks
3. Access Point Names
4. New APN or Settings More
5. Mobile networks
6. Access Point Names

To set for iPhone: If your carrier allows it, you can view the APN settings on your iOS device in Settings

1. Cellular
2. Cellular Data Network. AIS does not allow this.