tilde over a symbol Phi

Please suggest me a way to put tilde over a symbol phi. I can easily put it over a letter but coming to the case of symbols, it is giving problems. Thanks in advance.

• What about $\tilde{\phi}$? – Claudio Fiandrino Aug 9 '12 at 6:39
• More generally: accents in math mode use different commands to accents in text mode. – Niel de Beaudrap Aug 9 '12 at 9:07

Does \widetilde{\phi} work for you?