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Since last week , when the new unlimited plan was announced , various fake Verizon Unlimited Twitter accounts have appeared , and phishers have likewise been sending out bogus offers to upgrade .
 ( phishing: been sending out,  phishers: attacker, fake Verizon Unlimited Twitter accounts: trusted entity, bogus offers to upgrade: attack pattern) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( phishing: been sending out,  phishers: attacker, fake Verizon Unlimited Twitter accounts: trusted entity, bogus offers to upgrade: attack pattern) 