Have you noticed sending failed error on ufone (Pakistan) network these days?
I’ve been noticing various errors in ufone service from past couple of months. Whenever they provide any new package, some of the 
Telecommunication service provider in Pakistan are trying to provide cheapest and competition services in Pakistan, but this is also affecting their quality of service. They should focus on improving the quality too rather than just trying to reduce the rates!
Tip: whenever you send some important sms, do make sure that it’s status is sent + delivered