Hi I am using HTC wildfire S and using stock ROM. Andriod version: 2.3.5 HTC sense version: 2.1 Software no.: 2.26.720.3 I am unable to send multiple sms at a time or msg more than 160 characters. I get error as unable to send sms after multiple attempts. I have checked sms center no. and it is correct. I have tried other netwok sim cards also but get same error. But on other cell sms goes without any problem with same sim cards. After talking to HTC customer care I did factory reset but it didnt help me. Not even that, I have also installed new RUU i.e stock ROM but get same problem. Is there anyone genuine smart engineer here who can solve this complicated problem of mine?