Question

Write the full form
1. STD
2. ISD
3.
SMS
4.
UNI
5. PTI​

Answer 1

1 Subscriber Trunk Dialing

2. International Subscriber Dialing

3 Short Message Service

Hope it helps you......if it does then please mark me as brainliest.. I am sorry I don't know the full form of last two

Answer 2

1. Subscriber Trunk Dialing
2. international subscriber dialing
3. short message service
4. united news of india.
5. physical training instructor

I Hope it will help u ...

pls mark my answer as brainlist answer..