[35C3]
*#100#=Number request
*#101#=IMSI request

[E-Plus]
#E-Plus, see
#http://www.prepaid-wiki.de/index.php5/E-Plus
*100#=Balance enquiry

[FYVE]
#FYVE, see
#http://www.prepaid-wiki.de/index.php5/FYVE#Servicefunktionen
*100#=Balance enquiry and charging menu
*106#=Balance enquiry

[Monacell]
#like Virgin
*144#=Balance enquiry

[MTN]
#MTN, see
#http://www.mtn.co.za/Support/faq/Pages/USSD.aspx
*141#=Balance enquiry
*141*4#=Tariff Analyser and Priceplan Migrations menu
*141*4*0#=Tariff Analyser
*141*6*0#=Data bundle cancellation
*141*7*0#=SMS bundle cancellation
*141*8#=Yello Fortune Entries

[NRJ]
#like Virgin
*144#=Balance enquiry

[Telekom.de]
*2221#=Multi-SIM: current status
*2222#=Multi-SIM: set card as default

[Virgin]
#Virgin Mobile, see
#http://fr.wikipedia.org/wiki/Unstructured_Supplementary_Service_Data
*144#=Balance enquiry

[Vodafone]
#Vodafone India, see
#http://broadbandforum.in/vodafone-3g/66861-important-vodafone-sms-codes-ussd/
*141#=Balance enquiry
*444#=Self-service portal
*225*6#=See unused GPRS data and expiry
*225*3#=See unused 3G data and expiry
*444*5#=Activate 30MB, 1 day, GPRS plan