Android phone: cannot send sms & make outgoing call

What an experience i have with an Android phone. Samsung Nexus S in particular.
1) cannot charge to 100%. had switched batt and sent to change motherboard. known problem in forums
2) found out later that this is different from Google Nexus S with AMOLED display
3) battery drains pretty fast, comparing to previous experience with iPhone 3G
4) recent encounters: SMS cannot be sent out and cannot make outgoing call when 3G data network is switched on. when switched to GPRS, it's ok. changed SIM card, sent phone for change of motherboard, still same problem. finally saw one suggestion in forums, clear data for the stock "Dialler" and "Messaging" apps. been working well so far.
Steps: Settings > Applications > Manage applications > All > "Dialler" AND "Messaging" > Clear Data

Afternote: the above does not solve the problem with 3G and SMS and voice calls (item 4). in the end, have to wait til M1 and Samsung to resolve this issue from their side. I'm just glad this saga is over and hope that it is the last of this phone. enough of bad experience.