SMS/Pager notifications within up.time rely on the ability to send an email to your mobile provider, and having them deliver it as a sms notification.
Here's the email address formats for some of the more popular mobile providers:
Alltel
[10-digit phone number]@message.alltel.com
Example: [email protected]
AT&T (formerly Cingular)
[10-digit phone number]@txt.att.net
Example: [email protected]
For multimedia messages, use [10-digit-number]@mms.att.net
Example: [email protected]
Boost Mobile
[10-digit phone number]@myboostmobile.com
Example: [email protected]
Cricket Wireless
[10-digit phone number]@sms.mycricket.com
Example: [email protected]
For multimedia messages: [10-digit phone number]@mms.mycricket.com
Example: [email protected]
Nextel (now part of Sprint Nextel)
[10-digit telephone number]@messaging.nextel.com
Example: [email protected]
Sprint (now Sprint Nextel)
[10-digit phone number]@messaging.sprintpcs.com
Example: [email protected]
T-Mobile
[10-digit phone number]@tmomail.net
Example: [email protected]
Verizon
[10-digit phone number]@vtext.com
Example: [email protected]
Virgin Mobile USA
[10-digit phone number]@vmobl.com
Example: [email protected]