Then her phone seriously got problem

I think so too

But now overall I don't face any problems with text messaging or calling.

Calling seldom have problems is the sms delays which poses problems

But then again, if I have that problem normally what I do is just turn off my phone and leave it for 10 mins or so. Kononnya they say can help reset the line itself.

I'm using Digi & Maxis.
Faced this problem with Digi last month.

I face it with maxis sometimes. I remembered it was so bad the next day I only got the sms response that my sms was received. It was that bad.

Yes I heard of this before too but actually I feel it's useless

Use Maxis previously and experience the delay as well. But when changed to DiGi, it's worse. More SMS prone to delay. Some are delayed for hours. Even on Maxis its only a few minutes late.

I know its delayed due to recipient suddenly answering to a msg I sent hours ago. And yes, its my msg that was late, not theirs.

It could be the recipient did not reply to ur message immediately

should enable the report so dat you know when its been delivered...

I have seen cases whereby the delivery report comes on the next day but the person already receive the day earlier

Well not all the time when the report says "Sent" the message is really sent. Sometimes it's still stuck in their system.

Yup that's true. Once I saw a message came the next day and the sent thing was yesterday

Somehow that is pretty normal. Mine goes like message sent but recipient didn't receive.

How long did you set your validity period? 1h 6h 24 h or max?

Maxis user. Encountered the sms delay issue once in awhile. Annoying!

got de delay... but sometimes...

worst is when ur recipient is in a no signal area... the sms will be much more delayed... and u gotto sort of like 'ping' their system but sending a sms out or try to make a call or etc... then, u'll receive ur pending sms...

hahaaa!

Donate some number to ping the system,the number are 123,122 ,1111 and 0162211800, i always use above mention number to ping my digi network after i came out from out of service area. Ping 1 time all unrecive sms will 1 shot comes in.

care to share? How do u actually ping those numbers using phone?

Easy,all those number are FOC number if you use Malaysia's 3 main cellular network. Let say if you use Hotlink then you use 122 to make a call until timer start rolling,by doing this will tell RBS that you are now active and alive and kicking.
If you use celcom,call 1111 , digi=0162211800,maxis=123