Warid SIM card is available in Congo, Pakistan and Uganda. From which country are you from?
The HTC phone from London might have been locked to some network from United Kingdom. That is why your Warid SIM card is not working with it.
To make your SIM card work with the HTC phone, You need to unlock it. The safest and easiest way to unlock any phone is using unlock code. You can unlock your HTC phone too using unlock code itself. You can get the unlock code for a HTC phone from
ClassicUnlocking.com at affordable cost with easy unlocking guide. Good luck.
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