You should refer to uber app. Uber may not be the cheapest at times but it gives the best experience. Since Grab has Temasak holdings as it's shareholder. Go and get more fundings from them to work on the development team or else I reckon grab will lose out uber one day [Latest updates: I found out the root cause. apparently the application is unable to work well inside the house where the network signal (Singtel LTE) is not strong and the moment i step out of my house, everything back to normal operation (i.e. adding of credit card or booking ) strangely, i am able to send messages and surf the net in my house. Using uber in my house with the same phone is not an issue either.]
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